21612631267412 has 12 divisors (see below), whose sum is σ = 38119916567040. Its totient is φ = 10721226533976.

The previous prime is 21612631267361. The next prime is 21612631267439. The reversal of 21612631267412 is 21476213621612.

It is a super-2 number, since 2×21612631267412² (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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21272274362 + ... + 21272275377.

It is an arithmetic number, because the mean of its divisors is an integer number (3176659713920).

Almost surely, 2^{21612631267412} is an apocalyptic number.

It is an amenable number.

21612631267412 is a deficient number, since it is larger than the sum of its proper divisors (16507285299628).

21612631267412 is a wasteful number, since it uses less digits than its factorization.

21612631267412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42544549870 (or 42544549868 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The spelling of 21612631267412 in words is "twenty-one trillion, six hundred twelve billion, six hundred thirty-one million, two hundred sixty-seven thousand, four hundred twelve".