21221010202012 has 12 divisors (see below), whose sum is σ = 37256178684816. Its totient is φ = 10576387720640.

The previous prime is 21221010201929. The next prime is 21221010202111. The reversal of 21221010202012 is 21020201012212.

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 3 ways as a sum of consecutive naturals, for example, 8529343693 + ... + 8529346180.

It is an arithmetic number, because the mean of its divisors is an integer number (3104681557068).

Almost surely, 2^{21221010202012} is an apocalyptic number.

It is an amenable number.

21221010202012 is a deficient number, since it is larger than the sum of its proper divisors (16035168482804).

21221010202012 is a wasteful number, since it uses less digits than its factorization.

21221010202012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17058690188 (or 17058690186 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221010202012 its reverse (21020201012212), we get a palindrome (42241211214224).

The spelling of 21221010202012 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, two hundred two thousand, twelve".