21175019425 has 24 divisors (see below), whose sum is σ = 30016636352. Its totient is φ = 14515848000.

The previous prime is 21175019423. The next prime is 21175019429. The reversal of 21175019425 is 52491057112.

It is not a de Polignac number, because 21175019425 - 2¹ = 21175019423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21175019423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 672535 + ... + 703315.

Almost surely, 2^21175019425 is an apocalyptic number.

21175019425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21175019425 is a deficient number, since it is larger than the sum of its proper divisors (8841616927).

21175019425 is a wasteful number, since it uses less digits than its factorization.

21175019425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34729 (or 34724 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 21175019425 in words is "twenty-one billion, one hundred seventy-five million, nineteen thousand, four hundred twenty-five".