21476268 has 72 divisors (see below), whose sum is σ = 59741136. Its totient is φ = 6451200.

The previous prime is 21476263. The next prime is 21476281. The reversal of 21476268 is 86267412.

21476268 is a `hidden beast` number, since 21 + 4 + 7 + 626 + 8 = 666.

It is a super-2 number, since 2×21476268² = 922460174415648, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21476261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76288 + ... + 76568.

It is an arithmetic number, because the mean of its divisors is an integer number (829738).

Almost surely, 2^21476268 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21476268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29870568).

21476268 is an abundant number, since it is smaller than the sum of its proper divisors (38264868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21476268 is a wasteful number, since it uses less digits than its factorization.

21476268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495 (or 490 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 21476268 is about 4634.2494537951. The cubic root of 21476268 is about 277.9625400244.

It can be divided in two parts, 21 and 476268, that multiplied together give a triangular number (10001628 = T₄₄₇₂).

The spelling of 21476268 in words is "twenty-one million, four hundred seventy-six thousand, two hundred sixty-eight".