21202642325 has 12 divisors (see below), whose sum is σ = 26293179108. Its totient is φ = 16960886400.

The previous prime is 21202642309. The next prime is 21202642327. The reversal of 21202642325 is 52324620212.

It can be written as a sum of positive squares in 6 ways, for example, as 1118367364 + 20084274961 = 33442^2 + 141719^2 .

It is not a de Polignac number, because 21202642325 - 2⁴ = 21202642309 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 (21202642327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 505145 + ... + 545505.

It is an arithmetic number, because the mean of its divisors is an integer number (2191098259).

Almost surely, 2^21202642325 is an apocalyptic number.

21202642325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21202642325 is a deficient number, since it is larger than the sum of its proper divisors (5090536783).

21202642325 is a wasteful number, since it uses less digits than its factorization.

21202642325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61384 (or 61379 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The spelling of 21202642325 in words is "twenty-one billion, two hundred two million, six hundred forty-two thousand, three hundred twenty-five".