21477268 has 12 divisors (see below), whose sum is σ = 37764832. Its totient is φ = 10687320.

The previous prime is 21477263. The next prime is 21477283. The reversal of 21477268 is 86277412.

It is a super-2 number, since 2×21477268² = 922546081487648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477263) 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, 11880 + ... + 13567.

Almost surely, 2^21477268 is an apocalyptic number.

It is an amenable number.

21477268 is a deficient number, since it is larger than the sum of its proper divisors (16287564).

21477268 is a wasteful number, since it uses less digits than its factorization.

21477268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25662 (or 25660 counting only the distinct ones).

The product of its digits is 37632, while the sum is 37.

The square root of 21477268 is about 4634.3573448753. The cubic root of 21477268 is about 277.9668542163.

It can be divided in two parts, 214772 and 68, that added together give a triangular number (214840 = T₆₅₅).

The spelling of 21477268 in words is "twenty-one million, four hundred seventy-seven thousand, two hundred sixty-eight".