21021320514012 has 192 divisors, whose sum is σ = 63319678464000. Its totient is φ = 5279472774144.

The previous prime is 21021320513969. The next prime is 21021320514023. The reversal of 21021320514012 is 21041502312012.

It is a happy number.

It is a super-2 number, since 2×21021320514012² (a number of 27 digits) contains 22 as substring.

It is a congruent 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 63 ways as a sum of consecutive naturals, for example, 3635887 + ... + 7433862.

It is an arithmetic number, because the mean of its divisors is an integer number (329789992000).

Almost surely, 2^{21021320514012} is an apocalyptic number.

It is an amenable number.

21021320514012 is an abundant number, since it is smaller than the sum of its proper divisors (42298357949988).

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

21021320514012 is a wasteful number, since it uses less digits than its factorization.

21021320514012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11069860 (or 11069858 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21021320514012 its reverse (21041502312012), we get a palindrome (42062822826024).

The spelling of 21021320514012 in words is "twenty-one trillion, twenty-one billion, three hundred twenty million, five hundred fourteen thousand, twelve".