21507870583 has 2 divisors, whose sum is σ = 21507870584. Its totient is φ = 21507870582.

The previous prime is 21507870581. The next prime is 21507870599. The reversal of 21507870583 is 38507870512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21507870583 - 2¹ = 21507870581 is a prime.

Together with 21507870581, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21507870581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753935291 + 10753935292.

It is an arithmetic number, because the mean of its divisors is an integer number (10753935292).

Almost surely, 2^21507870583 is an apocalyptic number.

21507870583 is a deficient number, since it is larger than the sum of its proper divisors (1).

21507870583 is an equidigital number, since it uses as much as digits as its factorization.

21507870583 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 21507870583 in words is "twenty-one billion, five hundred seven million, eight hundred seventy thousand, five hundred eighty-three".