121021100220 has 48 divisors (see below), whose sum is σ = 339159411360. Its totient is φ = 32243690496.

The previous prime is 121021100177. The next prime is 121021100231. The reversal of 121021100220 is 22001120121.

It is a super-2 number, since 2×121021100220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121021100196 and 121021100205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 825537 + ... + 961016.

It is an arithmetic number, because the mean of its divisors is an integer number (7065821070).

Almost surely, 2^121021100220 is an apocalyptic number.

121021100220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021100220 is an abundant number, since it is smaller than the sum of its proper divisors (218138311140).

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

121021100220 is a wasteful number, since it uses less digits than its factorization.

121021100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787694 (or 1787692 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121021100220 its reverse (22001120121), we get a palindrome (143022220341).

The spelling of 121021100220 in words is "one hundred twenty-one billion, twenty-one million, one hundred thousand, two hundred twenty".