21612631271406 has 64 divisors (see below), whose sum is σ = 49773759275520. Its totient is φ = 6128378426880.

The previous prime is 21612631271393. The next prime is 21612631271423. The reversal of 21612631271406 is 60417213621612.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21847365 + ... + 22815183.

It is an arithmetic number, because the mean of its divisors is an integer number (777714988680).

Almost surely, 2^{21612631271406} is an apocalyptic number.

21612631271406 is an abundant number, since it is smaller than the sum of its proper divisors (28161128004114).

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

21612631271406 is a wasteful number, since it uses less digits than its factorization.

21612631271406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971849.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 21612631271406 in words is "twenty-one trillion, six hundred twelve billion, six hundred thirty-one million, two hundred seventy-one thousand, four hundred six".