21261022352012 has 6 divisors (see below), whose sum is σ = 37206789116028. Its totient is φ = 10630511176004.

The previous prime is 21261022351993. The next prime is 21261022352023. The reversal of 21261022352012 is 21025322016212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2657627793998 + ... + 2657627794005.

It is an arithmetic number, because the mean of its divisors is an integer number (6201131519338).

Almost surely, 2^{21261022352012} is an apocalyptic number.

It is an amenable number.

21261022352012 is a deficient number, since it is larger than the sum of its proper divisors (15945766764016).

21261022352012 is a wasteful number, since it uses less digits than its factorization.

21261022352012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5315255588007 (or 5315255588005 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21261022352012 its reverse (21025322016212), we get a palindrome (42286344368224).

The spelling of 21261022352012 in words is "twenty-one trillion, two hundred sixty-one billion, twenty-two million, three hundred fifty-two thousand, twelve".