121021221101220 has 72 divisors (see below), whose sum is σ = 400470222559680. Its totient is φ = 29338477842240.

The previous prime is 121021221101213. The next prime is 121021221101227. The reversal of 121021221101220 is 22101122120121.

121021221101220 is a `hidden beast` number, since 1 + 21 + 0 + 212 + 211 + 0 + 1 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (121021221101213) and next prime (121021221101227).

It is a super-2 number, since 2×121021221101220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121021221101193 and 121021221101202.

It is not an unprimeable number, because it can be changed into a prime (121021221101227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30560912440 + ... + 30560916399.

It is an arithmetic number, because the mean of its divisors is an integer number (5562086424440).

Almost surely, 2^{121021221101220} is an apocalyptic number.

121021221101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021221101220 is an abundant number, since it is smaller than the sum of its proper divisors (279449001458460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121021221101220 is a wasteful number, since it uses less digits than its factorization.

121021221101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61121828865 (or 61121828860 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121021221101220 its reverse (22101122120121), we get a palindrome (143122343221341).

The spelling of 121021221101220 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, one hundred one thousand, two hundred twenty".