21046525 has 24 divisors (see below), whose sum is σ = 27315464. Its totient is φ = 16070400.

The previous prime is 21046513. The next prime is 21046537. The reversal of 21046525 is 52564012.

It is an interprime number because it is at equal distance from previous prime (21046513) and next prime (21046537).

It can be written as a sum of positive squares in 12 ways, for example, as 6461764 + 14584761 = 2542^2 + 3819^2 .

It is not a de Polignac number, because 21046525 - 2¹¹ = 21044477 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21046525.

It is a congruent 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, 56239 + ... + 56611.

Almost surely, 2^21046525 is an apocalyptic number.

21046525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21046525 is a deficient number, since it is larger than the sum of its proper divisors (6268939).

21046525 is a wasteful number, since it uses less digits than its factorization.

21046525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 476 counting only the distinct ones).

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

The square root of 21046525 is about 4587.6491801357. The cubic root of 21046525 is about 276.0960117202.

It can be divided in two parts, 210465 and 25, that multiplied together give a palindrome (5261625).

The spelling of 21046525 in words is "twenty-one million, forty-six thousand, five hundred twenty-five".