12121012120020 has 48 divisors (see below), whose sum is σ = 33939044220480. Its totient is φ = 3232249871616.

The previous prime is 12121012120003. The next prime is 12121012120121. The reversal of 12121012120020 is 2002121012121.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 10889664 + ... + 11951016.

It is an arithmetic number, because the mean of its divisors is an integer number (707063421260).

Almost surely, 2^{12121012120020} is an apocalyptic number.

12121012120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121012120020 is an abundant number, since it is smaller than the sum of its proper divisors (21818032100460).

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

12121012120020 is a wasteful number, since it uses less digits than its factorization.

12121012120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251704 (or 1251702 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12121012120020 its reverse (2002121012121), we get a palindrome (14123133132141).

The spelling of 12121012120020 in words is "twelve trillion, one hundred twenty-one billion, twelve million, one hundred twenty thousand, twenty".