21460525 has 12 divisors (see below), whose sum is σ = 27470464. Its totient is φ = 16614000.

The previous prime is 21460501. The next prime is 21460547. The reversal of 21460525 is 52506412.

It is not a de Polignac number, because 21460525 - 2²³ = 13071917 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21460525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13071 + ... + 14620.

Almost surely, 2^21460525 is an apocalyptic number.

21460525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21460525 is a deficient number, since it is larger than the sum of its proper divisors (6009939).

21460525 is a wasteful number, since it uses less digits than its factorization.

21460525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27732 (or 27727 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 21460525 is about 4632.5505933557. The cubic root of 21460525 is about 277.8946040441.

Adding to 21460525 its reverse (52506412), we get a palindrome (73966937).

The spelling of 21460525 in words is "twenty-one million, four hundred sixty thousand, five hundred twenty-five".