21393719585131 has 4 divisors (see below), whose sum is σ = 22652173678392. Its totient is φ = 20135265491872.

The previous prime is 21393719585071. The next prime is 21393719585149. The reversal of 21393719585131 is 13158591739312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21393719585131 - 2¹⁹ = 21393719060843 is a prime.

It is a super-2 number, since 2×21393719585131² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21393719585731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629227046605 + ... + 629227046638.

It is an arithmetic number, because the mean of its divisors is an integer number (5663043419598).

Almost surely, 2^{21393719585131} is an apocalyptic number.

21393719585131 is a deficient number, since it is larger than the sum of its proper divisors (1258454093261).

21393719585131 is a wasteful number, since it uses less digits than its factorization.

21393719585131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258454093260.

The product of its digits is 6123600, while the sum is 58.

The spelling of 21393719585131 in words is "twenty-one trillion, three hundred ninety-three billion, seven hundred nineteen million, five hundred eighty-five thousand, one hundred thirty-one".