21573465131 has 2 divisors, whose sum is σ = 21573465132. Its totient is φ = 21573465130.

The previous prime is 21573465097. The next prime is 21573465149. The reversal of 21573465131 is 13156437512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21573465131 is a prime.

It is a super-3 number, since 3×21573465131³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (21573464131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10786732565 + 10786732566.

It is an arithmetic number, because the mean of its divisors is an integer number (10786732566).

Almost surely, 2^21573465131 is an apocalyptic number.

21573465131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21573465131 is an equidigital number, since it uses as much as digits as its factorization.

21573465131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The spelling of 21573465131 in words is "twenty-one billion, five hundred seventy-three million, four hundred sixty-five thousand, one hundred thirty-one".