121221021011220 has 96 divisors (see below), whose sum is σ = 406142224266240. Its totient is φ = 29839020554880.

The previous prime is 121221021011213. The next prime is 121221021011231. The reversal of 121221021011220 is 22110120122121.

121221021011220 is a `hidden beast` number, since 1 + 2 + 1 + 221 + 0 + 210 + 11 + 220 = 666.

It is a super-2 number, since 2×121221021011220² (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 = 121221021011193 and 121221021011202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8633968836 + ... + 8633982875.

It is an arithmetic number, because the mean of its divisors is an integer number (4230648169440).

Almost surely, 2^{121221021011220} is an apocalyptic number.

121221021011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221021011220 is an abundant number, since it is smaller than the sum of its proper divisors (284921203255020).

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

121221021011220 is a wasteful number, since it uses less digits than its factorization.

121221021011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17267951742 (or 17267951734 counting only the distinct ones).

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

Adding to 121221021011220 its reverse (22110120122121), we get a palindrome (143331141133341).

The spelling of 121221021011220 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, eleven thousand, two hundred twenty".