21110442325 has 72 divisors (see below), whose sum is σ = 32220991296. Its totient is φ = 13393843200.

The previous prime is 21110442307. The next prime is 21110442371. The reversal of 21110442325 is 52324401112.

It is not a de Polignac number, because 21110442325 - 2²¹ = 21108345173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110442325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11069022 + ... + 11070928.

It is an arithmetic number, because the mean of its divisors is an integer number (447513768).

Almost surely, 2^21110442325 is an apocalyptic number.

21110442325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21110442325 is a deficient number, since it is larger than the sum of its proper divisors (11110548971).

21110442325 is a wasteful number, since it uses less digits than its factorization.

21110442325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063 (or 1997 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21110442325 its reverse (52324401112), we get a palindrome (73434843437).

The spelling of 21110442325 in words is "twenty-one billion, one hundred ten million, four hundred forty-two thousand, three hundred twenty-five".