21278540223715 has 32 divisors (see below), whose sum is σ = 26484238558080. Its totient is φ = 16392603515904.

The previous prime is 21278540223613. The next prime is 21278540223737. The reversal of 21278540223715 is 51732204587212.

It is a cyclic number.

It is not a de Polignac number, because 21278540223715 - 2¹³ = 21278540215523 is a prime.

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, 751957447 + ... + 751985743.

It is an arithmetic number, because the mean of its divisors is an integer number (827632454940).

Almost surely, 2^{21278540223715} is an apocalyptic number.

21278540223715 is a deficient number, since it is larger than the sum of its proper divisors (5205698334365).

21278540223715 is a wasteful number, since it uses less digits than its factorization.

21278540223715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41791.

The product of its (nonzero) digits is 1881600, while the sum is 49.

The spelling of 21278540223715 in words is "twenty-one trillion, two hundred seventy-eight billion, five hundred forty million, two hundred twenty-three thousand, seven hundred fifteen".