21102013325 has 12 divisors (see below), whose sum is σ = 26425573908. Its totient is φ = 16714464000.

The previous prime is 21102013319. The next prime is 21102013381. The reversal of 21102013325 is 52331020112.

It can be written as a sum of positive squares in 6 ways, for example, as 272019049 + 20829994276 = 16493^2 + 144326^2 .

It is not a de Polignac number, because 21102013325 - 2¹⁰ = 21102012301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102013297 and 21102013306.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4176092 + ... + 4181141.

It is an arithmetic number, because the mean of its divisors is an integer number (2202131159).

Almost surely, 2^21102013325 is an apocalyptic number.

21102013325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21102013325 is a deficient number, since it is larger than the sum of its proper divisors (5323560583).

21102013325 is a wasteful number, since it uses less digits than its factorization.

21102013325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8357344 (or 8357339 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21102013325 its reverse (52331020112), we get a palindrome (73433033437).

The spelling of 21102013325 in words is "twenty-one billion, one hundred two million, thirteen thousand, three hundred twenty-five".