21711251504 has 20 divisors (see below), whose sum is σ = 42068166840. Its totient is φ = 10854950400.

The previous prime is 21711251501. The next prime is 21711251519. The reversal of 21711251504 is 40515211712.

It is not an unprimeable number, because it can be changed into a prime (21711251501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314207 + ... + 377025.

It is an arithmetic number, because the mean of its divisors is an integer number (2103408342).

Almost surely, 2^21711251504 is an apocalyptic number.

It is an amenable number.

21711251504 is a deficient number, since it is larger than the sum of its proper divisors (20356915336).

21711251504 is a wasteful number, since it uses less digits than its factorization.

21711251504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84428 (or 84422 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The spelling of 21711251504 in words is "twenty-one billion, seven hundred eleven million, two hundred fifty-one thousand, five hundred four".