21611126013725 has 12 divisors (see below), whose sum is σ = 26822449277184. Its totient is φ = 17272995636720.

The previous prime is 21611126013691. The next prime is 21611126013731. The reversal of 21611126013725 is 52731062111612.

It is not a de Polignac number, because 21611126013725 - 2⁸ = 21611126013469 is a prime.

It is a super-2 number, since 2×21611126013725² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 397601639 + ... + 397655988.

It is an arithmetic number, because the mean of its divisors is an integer number (2235204106432).

Almost surely, 2^{21611126013725} is an apocalyptic number.

21611126013725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21611126013725 is a deficient number, since it is larger than the sum of its proper divisors (5211323263459).

21611126013725 is a wasteful number, since it uses less digits than its factorization.

21611126013725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795258724 (or 795258719 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 21611126013725 in words is "twenty-one trillion, six hundred eleven billion, one hundred twenty-six million, thirteen thousand, seven hundred twenty-five".