121002021221220 has 72 divisors (see below), whose sum is σ = 367042555239360. Its totient is φ = 32266933934400.

The previous prime is 121002021221219. The next prime is 121002021221251. The reversal of 121002021221220 is 22122120200121.

It is a happy number.

121002021221220 is a `hidden beast` number, since 1 + 21 + 0 + 0 + 202 + 1 + 221 + 220 = 666.

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 = 121002021221193 and 121002021221202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19073391 + ... + 24612969.

Almost surely, 2^{121002021221220} is an apocalyptic number.

121002021221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121002021221220 is an abundant number, since it is smaller than the sum of its proper divisors (246040534018140).

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

121002021221220 is a wasteful number, since it uses less digits than its factorization.

121002021221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5660945 (or 5660940 counting only the distinct ones).

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

Adding to 121002021221220 its reverse (22122120200121), we get a palindrome (143124141421341).

The spelling of 121002021221220 in words is "one hundred twenty-one trillion, two billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty".