121021212002220 has 144 divisors (see below), whose sum is σ = 389542190663808. Its totient is φ = 30307487109120.

The previous prime is 121021212002179. The next prime is 121021212002261. The reversal of 121021212002220 is 22200212120121.

It is a happy number.

121021212002220 is a `hidden beast` number, since 1 + 210 + 21 + 212 + 0 + 0 + 2 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (121021212002179) and next prime (121021212002261).

It is a super-2 number, since 2×121021212002220² (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 = 121021212002193 and 121021212002202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41872276 + ... + 44669115.

It is an arithmetic number, because the mean of its divisors is an integer number (2705154101832).

Almost surely, 2^{121021212002220} is an apocalyptic number.

121021212002220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021212002220 is an abundant number, since it is smaller than the sum of its proper divisors (268520978661588).

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

121021212002220 is a wasteful number, since it uses less digits than its factorization.

121021212002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86541880 (or 86541875 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121021212002220 its reverse (22200212120121), we get a palindrome (143221424122341).

The spelling of 121021212002220 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred twelve million, two thousand, two hundred twenty".