21311454612 has 48 divisors (see below), whose sum is σ = 56905788800. Its totient is φ = 6080925312.

The previous prime is 21311454599. The next prime is 21311454613. The reversal of 21311454612 is 21645411312.

It is a self number, because there is not a number n which added to its sum of digits gives 21311454612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311454613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103987 + ... + 231162.

Almost surely, 2^21311454612 is an apocalyptic number.

It is an amenable number.

21311454612 is an abundant number, since it is smaller than the sum of its proper divisors (35594334188).

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

21311454612 is a wasteful number, since it uses less digits than its factorization.

21311454612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335920 (or 335918 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

Adding to 21311454612 its reverse (21645411312), we get a palindrome (42956865924).

The spelling of 21311454612 in words is "twenty-one billion, three hundred eleven million, four hundred fifty-four thousand, six hundred twelve".