121210102020 has 96 divisors (see below), whose sum is σ = 391712783616. Its totient is φ = 27430848000.

The previous prime is 121210102009. The next prime is 121210102103. The reversal of 121210102020 is 20201012121.

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 = 121210101987 and 121210102005.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1386271 + ... + 1471110.

It is an arithmetic number, because the mean of its divisors is an integer number (4080341496).

Almost surely, 2^121210102020 is an apocalyptic number.

121210102020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121210102020 is an abundant number, since it is smaller than the sum of its proper divisors (270502681596).

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

121210102020 is a wasteful number, since it uses less digits than its factorization.

121210102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857501 (or 2857499 counting only the distinct ones).

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

Adding to 121210102020 its reverse (20201012121), we get a palindrome (141411114141).

The spelling of 121210102020 in words is "one hundred twenty-one billion, two hundred ten million, one hundred two thousand, twenty".