21050115425 has 24 divisors (see below), whose sum is σ = 26404202880. Its totient is φ = 16645953600.

The previous prime is 21050115397. The next prime is 21050115451. The reversal of 21050115425 is 52451105012.

It is not a de Polignac number, because 21050115425 - 2²⁰ = 21049066849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21050115394 and 21050115403.

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, 1165514 + ... + 1183436.

It is an arithmetic number, because the mean of its divisors is an integer number (1100175120).

Almost surely, 2^21050115425 is an apocalyptic number.

21050115425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21050115425 is a deficient number, since it is larger than the sum of its proper divisors (5354087455).

21050115425 is a wasteful number, since it uses less digits than its factorization.

21050115425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18473 (or 18468 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 21050115425 in words is "twenty-one billion, fifty million, one hundred fifteen thousand, four hundred twenty-five".