21587522339 has 2 divisors, whose sum is σ = 21587522340. Its totient is φ = 21587522338.

The previous prime is 21587522323. The next prime is 21587522351. The reversal of 21587522339 is 93322578512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21587522339 - 2⁴ = 21587522323 is a prime.

It is a super-2 number, since 2×21587522339² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21587522293 and 21587522302.

It is not a weakly prime, because it can be changed into another prime (21587522639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10793761169 + 10793761170.

It is an arithmetic number, because the mean of its divisors is an integer number (10793761170).

Almost surely, 2^21587522339 is an apocalyptic number.

21587522339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21587522339 is an equidigital number, since it uses as much as digits as its factorization.

21587522339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 47.

The spelling of 21587522339 in words is "twenty-one billion, five hundred eighty-seven million, five hundred twenty-two thousand, three hundred thirty-nine".