21201022202012 has 24 divisors (see below), whose sum is σ = 37757889511104. Its totient is φ = 10414649152512.

The previous prime is 21201022201999. The next prime is 21201022202033. The reversal of 21201022202012 is 21020222010212.

It is a happy number.

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, 199369508 + ... + 199475819.

It is an arithmetic number, because the mean of its divisors is an integer number (1573245396296).

Almost surely, 2^{21201022202012} is an apocalyptic number.

It is an amenable number.

21201022202012 is a deficient number, since it is larger than the sum of its proper divisors (16556867309092).

21201022202012 is a wasteful number, since it uses less digits than its factorization.

21201022202012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398845565 (or 398845563 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21201022202012 its reverse (21020222010212), we get a palindrome (42221244212224).

The spelling of 21201022202012 in words is "twenty-one trillion, two hundred one billion, twenty-two million, two hundred two thousand, twelve".