21590617139443 has 64 divisors (see below), whose sum is σ = 25063536844800. Its totient is φ = 18393362064000.

The previous prime is 21590617139431. The next prime is 21590617139459. The reversal of 21590617139443 is 34493171609512.

It is a happy number.

It is not a de Polignac number, because 21590617139443 - 2⁵ = 21590617139411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21590617139743) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5492396188 + ... + 5492400118.

It is an arithmetic number, because the mean of its divisors is an integer number (391617763200).

Almost surely, 2^{21590617139443} is an apocalyptic number.

21590617139443 is a deficient number, since it is larger than the sum of its proper divisors (3472919705357).

21590617139443 is a wasteful number, since it uses less digits than its factorization.

21590617139443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4904.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 21590617139443 in words is "twenty-one trillion, five hundred ninety billion, six hundred seventeen million, one hundred thirty-nine thousand, four hundred forty-three".