21976223725 has 6 divisors (see below), whose sum is σ = 27250517450. Its totient is φ = 17580978960.

The previous prime is 21976223719. The next prime is 21976223749. The reversal of 21976223725 is 52732267912.

It can be written as a sum of positive squares in 3 ways, for example, as 365459689 + 21610764036 = 19117^2 + 147006^2 .

It is not a de Polignac number, because 21976223725 - 2¹³ = 21976215533 is a prime.

It is a super-2 number, since 2×21976223725² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 439524450 + ... + 439524499.

Almost surely, 2^21976223725 is an apocalyptic number.

21976223725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21976223725 is a deficient number, since it is larger than the sum of its proper divisors (5274293725).

21976223725 is an equidigital number, since it uses as much as digits as its factorization.

21976223725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879048959 (or 879048954 counting only the distinct ones).

The product of its digits is 635040, while the sum is 46.

The spelling of 21976223725 in words is "twenty-one billion, nine hundred seventy-six million, two hundred twenty-three thousand, seven hundred twenty-five".