21727104625 has 8 divisors (see below), whose sum is σ = 27115426728. Its totient is φ = 17381683600.

The previous prime is 21727104577. The next prime is 21727104631. The reversal of 21727104625 is 52640172712.

It can be written as a sum of positive squares in 4 ways, for example, as 1125669601 + 20601435024 = 33551^2 + 143532^2 .

It is not a de Polignac number, because 21727104625 - 2¹¹ = 21727102577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86908294 + ... + 86908543.

It is an arithmetic number, because the mean of its divisors is an integer number (3389428341).

Almost surely, 2^21727104625 is an apocalyptic number.

21727104625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21727104625 is a deficient number, since it is larger than the sum of its proper divisors (5388322103).

21727104625 is an equidigital number, since it uses as much as digits as its factorization.

21727104625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173816852 (or 173816842 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 21727104625 in words is "twenty-one billion, seven hundred twenty-seven million, one hundred four thousand, six hundred twenty-five".