21611353425 has 24 divisors (see below), whose sum is σ = 35745676416. Its totient is φ = 11521247040.

The previous prime is 21611353397. The next prime is 21611353433. The reversal of 21611353425 is 52435311612.

It is not a de Polignac number, because 21611353425 - 2¹² = 21611349329 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124647 + ... + 242403.

It is an arithmetic number, because the mean of its divisors is an integer number (1489403184).

Almost surely, 2^21611353425 is an apocalyptic number.

21611353425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21611353425 is a deficient number, since it is larger than the sum of its proper divisors (14134322991).

21611353425 is a wasteful number, since it uses less digits than its factorization.

21611353425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120217 (or 120212 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The spelling of 21611353425 in words is "twenty-one billion, six hundred eleven million, three hundred fifty-three thousand, four hundred twenty-five".