21522650587 has 2 divisors, whose sum is σ = 21522650588. Its totient is φ = 21522650586.

The previous prime is 21522650561. The next prime is 21522650671. The reversal of 21522650587 is 78505622512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21522650587 - 2²⁷ = 21388432859 is a prime.

It is not a weakly prime, because it can be changed into another prime (21522650537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10761325293 + 10761325294.

It is an arithmetic number, because the mean of its divisors is an integer number (10761325294).

Almost surely, 2^21522650587 is an apocalyptic number.

21522650587 is a deficient number, since it is larger than the sum of its proper divisors (1).

21522650587 is an equidigital number, since it uses as much as digits as its factorization.

21522650587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336000, while the sum is 43.

The spelling of 21522650587 in words is "twenty-one billion, five hundred twenty-two million, six hundred fifty thousand, five hundred eighty-seven".