21020003212012 has 36 divisors (see below), whose sum is σ = 42792295673064. Its totient is φ = 9008241258240.

The previous prime is 21020003212007. The next prime is 21020003212027. The reversal of 21020003212012 is 21021230002012.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3402943 + ... + 7322569.

Almost surely, 2^{21020003212012} is an apocalyptic number.

It is an amenable number.

21020003212012 is an abundant number, since it is smaller than the sum of its proper divisors (21772292461052).

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

21020003212012 is a wasteful number, since it uses less digits than its factorization.

21020003212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3947006 (or 3946997 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21020003212012 its reverse (21021230002012), we get a palindrome (42041233214024).

The spelling of 21020003212012 in words is "twenty-one trillion, twenty billion, three million, two hundred twelve thousand, twelve".