21703661125 has 16 divisors (see below), whose sum is σ = 27126521136. Its totient is φ = 17337062400.

The previous prime is 21703661123. The next prime is 21703661141. The reversal of 21703661125 is 52116630712.

It can be written as a sum of positive squares in 8 ways, for example, as 15174051489 + 6529609636 = 123183^2 + 80806^2 .

It is not a de Polignac number, because 21703661125 - 2¹ = 21703661123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21703661123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44872 + ... + 213121.

It is an arithmetic number, because the mean of its divisors is an integer number (1695407571).

Almost surely, 2^21703661125 is an apocalyptic number.

21703661125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21703661125 is a deficient number, since it is larger than the sum of its proper divisors (5422860011).

21703661125 is an equidigital number, since it uses as much as digits as its factorization.

21703661125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258681 (or 258671 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21703661125 in words is "twenty-one billion, seven hundred three million, six hundred sixty-one thousand, one hundred twenty-five".