21355456674370 has 128 divisors (see below), whose sum is σ = 47365222044672. Its totient is φ = 6750845337600.

The previous prime is 21355456674361. The next prime is 21355456674421. The reversal of 21355456674370 is 7347665455312.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3819610275 + ... + 3819615865.

It is an arithmetic number, because the mean of its divisors is an integer number (370040797224).

Almost surely, 2^{21355456674370} is an apocalyptic number.

21355456674370 is an abundant number, since it is smaller than the sum of its proper divisors (26009765370302).

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

21355456674370 is a wasteful number, since it uses less digits than its factorization.

21355456674370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9716.

The product of its (nonzero) digits is 63504000, while the sum is 58.

The spelling of 21355456674370 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred fifty-six million, six hundred seventy-four thousand, three hundred seventy".