21455414015555 has 16 divisors (see below), whose sum is σ = 28106818451040. Its totient is φ = 15626956969728.

The previous prime is 21455414015479. The next prime is 21455414015573. The reversal of 21455414015555 is 55551041455412.

It is not a de Polignac number, because 21455414015555 - 2²⁶ = 21455346906691 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2260839725 + ... + 2260849214.

It is an arithmetic number, because the mean of its divisors is an integer number (1756676153190).

Almost surely, 2^{21455414015555} is an apocalyptic number.

21455414015555 is a deficient number, since it is larger than the sum of its proper divisors (6651404435485).

21455414015555 is a wasteful number, since it uses less digits than its factorization.

21455414015555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521689030.

The product of its (nonzero) digits is 2000000, while the sum is 47.

The spelling of 21455414015555 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred fourteen million, fifteen thousand, five hundred fifty-five".