21476925 has 36 divisors (see below), whose sum is σ = 39215124. Its totient is φ = 11232000.

The previous prime is 21476921. The next prime is 21476927. The reversal of 21476925 is 52967412.

It can be written as a sum of positive squares in 6 ways, for example, as 1172889 + 20304036 = 1083^2 + 4506^2 .

It is not a de Polignac number, because 21476925 - 2² = 21476921 is a prime.

It is a super-2 number, since 2×21476925² = 922516614911250, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21476925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21476921) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11025 + ... + 12825.

It is an arithmetic number, because the mean of its divisors is an integer number (1089309).

Almost surely, 2^21476925 is an apocalyptic number.

21476925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21476925 is a deficient number, since it is larger than the sum of its proper divisors (17738199).

21476925 is a wasteful number, since it uses less digits than its factorization.

21476925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870 (or 1862 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 21476925 is about 4634.3203385178. The cubic root of 21476925 is about 277.9653744636.

The spelling of 21476925 in words is "twenty-one million, four hundred seventy-six thousand, nine hundred twenty-five".