20012121020 has 24 divisors (see below), whose sum is σ = 42277110624. Its totient is φ = 7956913856.

The previous prime is 20012121007. The next prime is 20012121043. The reversal of 20012121020 is 2012121002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20012120992 and 20012121010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2992487 + ... + 2999166.

It is an arithmetic number, because the mean of its divisors is an integer number (1761546276).

Almost surely, 2^20012121020 is an apocalyptic number.

20012121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012121020 is an abundant number, since it is smaller than the sum of its proper divisors (22264989604).

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

20012121020 is a wasteful number, since it uses less digits than its factorization.

20012121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5991829 (or 5991827 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20012121020 its reverse (2012121002), we get a palindrome (22024242022).

The spelling of 20012121020 in words is "twenty billion, twelve million, one hundred twenty-one thousand, twenty".