21140991604 has 48 divisors (see below), whose sum is σ = 39539404800. Its totient is φ = 9867493856.

The previous prime is 21140991589. The next prime is 21140991659. The reversal of 21140991604 is 40619904112.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1545507 + ... + 1559125.

It is an arithmetic number, because the mean of its divisors is an integer number (823737600).

Almost surely, 2^21140991604 is an apocalyptic number.

It is an amenable number.

21140991604 is a deficient number, since it is larger than the sum of its proper divisors (18398413196).

21140991604 is a wasteful number, since it uses less digits than its factorization.

21140991604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14052 (or 14050 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 21140991604 in words is "twenty-one billion, one hundred forty million, nine hundred ninety-one thousand, six hundred four".