21377440542215 has 32 divisors (see below), whose sum is σ = 26077086060480. Its totient is φ = 16821028105216.

The previous prime is 21377440542061. The next prime is 21377440542221. The reversal of 21377440542215 is 51224504477312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21377440542215 - 2¹² = 21377440538119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21377440542215.

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, 1070306969 + ... + 1070326941.

It is an arithmetic number, because the mean of its divisors is an integer number (814908939390).

Almost surely, 2^{21377440542215} is an apocalyptic number.

21377440542215 is a deficient number, since it is larger than the sum of its proper divisors (4699645518265).

21377440542215 is a wasteful number, since it uses less digits than its factorization.

21377440542215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31363.

The product of its (nonzero) digits is 1881600, while the sum is 47.

The spelling of 21377440542215 in words is "twenty-one trillion, three hundred seventy-seven billion, four hundred forty million, five hundred forty-two thousand, two hundred fifteen".