21409358056345 has 32 divisors (see below), whose sum is σ = 30909966785280. Its totient is φ = 13906583159040.

The previous prime is 21409358056309. The next prime is 21409358056399. The reversal of 21409358056345 is 54365085390412.

It is not a de Polignac number, because 21409358056345 - 2²⁷ = 21409223838617 is a prime.

It is a super-2 number, since 2×21409358056345² (a number of 27 digits) contains 22 as substring.

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, 4718115 + ... + 8067175.

It is an arithmetic number, because the mean of its divisors is an integer number (965936462040).

Almost surely, 2^{21409358056345} is an apocalyptic number.

It is an amenable number.

21409358056345 is a deficient number, since it is larger than the sum of its proper divisors (9500608728935).

21409358056345 is a wasteful number, since it uses less digits than its factorization.

21409358056345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3358705.

The product of its (nonzero) digits is 15552000, while the sum is 55.

The spelling of 21409358056345 in words is "twenty-one trillion, four hundred nine billion, three hundred fifty-eight million, fifty-six thousand, three hundred forty-five".