21312301012 has 6 divisors (see below), whose sum is σ = 37296526778. Its totient is φ = 10656150504.

The previous prime is 21312300991. The next prime is 21312301027. The reversal of 21312301012 is 21010321312.

It can be written as a sum of positive squares in only one way, i.e., 21258806416 + 53494596 = 145804^2 + 7314^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2664037623 + ... + 2664037630.

Almost surely, 2^21312301012 is an apocalyptic number.

It is an amenable number.

21312301012 is a deficient number, since it is larger than the sum of its proper divisors (15984225766).

21312301012 is a wasteful number, since it uses less digits than its factorization.

21312301012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5328075257 (or 5328075255 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21312301012 its reverse (21010321312), we get a palindrome (42322622324).

The spelling of 21312301012 in words is "twenty-one billion, three hundred twelve million, three hundred one thousand, twelve".