21020202012 has 24 divisors (see below), whose sum is σ = 49532756112. Its totient is φ = 6937360000.

The previous prime is 21020201977. The next prime is 21020202059.

21020202012 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8670489 + ... + 8672912.

It is an arithmetic number, because the mean of its divisors is an integer number (2063864838).

Almost surely, 2^21020202012 is an apocalyptic number.

It is an amenable number.

21020202012 is an abundant number, since it is smaller than the sum of its proper divisors (28512554100).

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

21020202012 is a wasteful number, since it uses less digits than its factorization.

21020202012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17343509 (or 17343507 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The spelling of 21020202012 in words is "twenty-one billion, twenty million, two hundred two thousand, twelve".