21142521599 has 2 divisors, whose sum is σ = 21142521600. Its totient is φ = 21142521598.

The previous prime is 21142521583. The next prime is 21142521623. The reversal of 21142521599 is 99512524112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21142521599 - 2⁴ = 21142521583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142526599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571260799 + 10571260800.

It is an arithmetic number, because the mean of its divisors is an integer number (10571260800).

Almost surely, 2^21142521599 is an apocalyptic number.

21142521599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142521599 is an equidigital number, since it uses as much as digits as its factorization.

21142521599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 41.

The spelling of 21142521599 in words is "twenty-one billion, one hundred forty-two million, five hundred twenty-one thousand, five hundred ninety-nine".