21929023225 has 18 divisors (see below), whose sum is σ = 27871437530. Its totient is φ = 17115302400.

The previous prime is 21929023219. The next prime is 21929023241. The reversal of 21929023225 is 52232092912.

It can be written as a sum of positive squares in 9 ways, for example, as 17086672656 + 4842350569 = 130716^2 + 69587^2 .

It is not a de Polignac number, because 21929023225 - 2⁷ = 21929023097 is a prime.

It is a super-3 number, since 3×21929023225³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 218880 + ... + 302929.

Almost surely, 2^21929023225 is an apocalyptic number.

21929023225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21929023225 is a deficient number, since it is larger than the sum of its proper divisors (5942414305).

21929023225 is an equidigital number, since it uses as much as digits as its factorization.

21929023225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521901 (or 521855 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 21929023225 in words is "twenty-one billion, nine hundred twenty-nine million, twenty-three thousand, two hundred twenty-five".