21707111725 has 48 divisors (see below), whose sum is σ = 30803153472. Its totient is φ = 15032540160.

The previous prime is 21707111711. The next prime is 21707111731. The reversal of 21707111725 is 52711170712.

It is not a de Polignac number, because 21707111725 - 2⁹ = 21707111213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1556634 + ... + 1570516.

It is an arithmetic number, because the mean of its divisors is an integer number (641732364).

Almost surely, 2^21707111725 is an apocalyptic number.

21707111725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21707111725 is a deficient number, since it is larger than the sum of its proper divisors (9096041747).

21707111725 is a wasteful number, since it uses less digits than its factorization.

21707111725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14206 (or 14201 counting only the distinct ones).

The product of its (nonzero) digits is 6860, while the sum is 34.

The spelling of 21707111725 in words is "twenty-one billion, seven hundred seven million, one hundred eleven thousand, seven hundred twenty-five".