21439257202529 has 16 divisors (see below), whose sum is σ = 22004075269440. Its totient is φ = 20877502282560.

The previous prime is 21439257202481. The next prime is 21439257202577. The reversal of 21439257202529 is 92520275293412.

It is an interprime number because it is at equal distance from previous prime (21439257202481) and next prime (21439257202577).

It is a cyclic number.

It is not a de Polignac number, because 21439257202529 - 2¹² = 21439257198433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21439257202729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34017527 + ... + 34642035.

It is an arithmetic number, because the mean of its divisors is an integer number (1375254704340).

Almost surely, 2^{21439257202529} is an apocalyptic number.

It is an amenable number.

21439257202529 is a deficient number, since it is larger than the sum of its proper divisors (564818066911).

21439257202529 is a wasteful number, since it uses less digits than its factorization.

21439257202529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626960.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 21439257202529 in words is "twenty-one trillion, four hundred thirty-nine billion, two hundred fifty-seven million, two hundred two thousand, five hundred twenty-nine".