21075892 has 6 divisors (see below), whose sum is σ = 36882818. Its totient is φ = 10537944.

The previous prime is 21075871. The next prime is 21075907. The reversal of 21075892 is 29857012.

It can be written as a sum of positive squares in only one way, i.e., 11115556 + 9960336 = 3334^2 + 3156^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2634483 + ... + 2634490.

Almost surely, 2^21075892 is an apocalyptic number.

It is an amenable number.

21075892 is a deficient number, since it is larger than the sum of its proper divisors (15806926).

21075892 is a wasteful number, since it uses less digits than its factorization.

21075892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5268977 (or 5268975 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 21075892 is about 4590.8487232755. The cubic root of 21075892 is about 276.2243677206.

The spelling of 21075892 in words is "twenty-one million, seventy-five thousand, eight hundred ninety-two".