21725591402 has 16 divisors (see below), whose sum is σ = 33473287392. Its totient is φ = 10567901520.

The previous prime is 21725591389. The next prime is 21725591411. The reversal of 21725591402 is 20419552712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891593 + ... + 915635.

It is an arithmetic number, because the mean of its divisors is an integer number (2092080462).

Almost surely, 2^21725591402 is an apocalyptic number.

21725591402 is a deficient number, since it is larger than the sum of its proper divisors (11747695990).

21725591402 is a wasteful number, since it uses less digits than its factorization.

21725591402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36293.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 21725591402 in words is "twenty-one billion, seven hundred twenty-five million, five hundred ninety-one thousand, four hundred two".