21331124593 has 2 divisors, whose sum is σ = 21331124594. Its totient is φ = 21331124592.

The previous prime is 21331124567. The next prime is 21331124641. The reversal of 21331124593 is 39542113312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21073457889 + 257666704 = 145167^2 + 16052^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331124593 - 2⁹ = 21331124081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21331124093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665562296 + 10665562297.

It is an arithmetic number, because the mean of its divisors is an integer number (10665562297).

Almost surely, 2^21331124593 is an apocalyptic number.

It is an amenable number.

21331124593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331124593 is an equidigital number, since it uses as much as digits as its factorization.

21331124593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

It can be divided in two parts, 21331 and 124593, that added together give a square (145924 = 382²).

The spelling of 21331124593 in words is "twenty-one billion, three hundred thirty-one million, one hundred twenty-four thousand, five hundred ninety-three".