21075476 has 12 divisors (see below), whose sum is σ = 37781940. Its totient is φ = 10280640.

The previous prime is 21075473. The next prime is 21075487. The reversal of 21075476 is 67457012.

It can be written as a sum of positive squares in 2 ways, for example, as 7562500 + 13512976 = 2750^2 + 3676^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21075473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64091 + ... + 64418.

It is an arithmetic number, because the mean of its divisors is an integer number (3148495).

Almost surely, 2^21075476 is an apocalyptic number.

It is an amenable number.

21075476 is a deficient number, since it is larger than the sum of its proper divisors (16706464).

21075476 is a wasteful number, since it uses less digits than its factorization.

21075476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128554 (or 128552 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 21075476 is about 4590.8034155254. The cubic root of 21075476 is about 276.2225503188. Note that the first 3 decimals are identical.

The spelling of 21075476 in words is "twenty-one million, seventy-five thousand, four hundred seventy-six".