21367425 has 12 divisors (see below), whose sum is σ = 35327600. Its totient is φ = 11395920.

The previous prime is 21367421. The next prime is 21367429. The reversal of 21367425 is 52476312.

It is an interprime number because it is at equal distance from previous prime (21367421) and next prime (21367429).

It is not a de Polignac number, because 21367425 - 2² = 21367421 is a prime.

It is a super-2 number, since 2×21367425² = 913133702261250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21367392 and 21367401.

It is not an unprimeable number, because it can be changed into a prime (21367421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142375 + ... + 142524.

Almost surely, 2^21367425 is an apocalyptic number.

21367425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21367425 is a deficient number, since it is larger than the sum of its proper divisors (13960175).

21367425 is a wasteful number, since it uses less digits than its factorization.

21367425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284912 (or 284907 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 21367425 is about 4622.4912114573. The cubic root of 21367425 is about 277.4921676225.

The spelling of 21367425 in words is "twenty-one million, three hundred sixty-seven thousand, four hundred twenty-five".