21329959025 has 12 divisors (see below), whose sum is σ = 26454492444. Its totient is φ = 17060520000.

The previous prime is 21329959003. The next prime is 21329959033. The reversal of 21329959025 is 52095992312.

It can be written as a sum of positive squares in 6 ways, for example, as 3145975921 + 18183983104 = 56089^2 + 134848^2 .

It is not a de Polignac number, because 21329959025 - 2³⁴ = 4150089841 is a prime.

It is a Duffinian number.

It is a Curzon 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, 43895 + ... + 211155.

It is an arithmetic number, because the mean of its divisors is an integer number (2204541037).

Almost surely, 2^21329959025 is an apocalyptic number.

21329959025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21329959025 is a deficient number, since it is larger than the sum of its proper divisors (5124533419).

21329959025 is a wasteful number, since it uses less digits than its factorization.

21329959025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172372 (or 172367 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 47.

The spelling of 21329959025 in words is "twenty-one billion, three hundred twenty-nine million, nine hundred fifty-nine thousand, twenty-five".