21576672 has 192 divisors, whose sum is σ = 72394560. Its totient is φ = 6193152.

The previous prime is 21576641. The next prime is 21576673. The reversal of 21576672 is 27667512.

21576672 is a `hidden beast` number, since 21 + 576 + 67 + 2 = 666.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21576673) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190888 + ... + 191000.

It is an arithmetic number, because the mean of its divisors is an integer number (377055).

Almost surely, 2^21576672 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 21576672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36197280).

21576672 is an abundant number, since it is smaller than the sum of its proper divisors (50817888).

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

21576672 is a wasteful number, since it uses less digits than its factorization.

21576672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 148 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 21576672 is about 4645.0696442572. The cubic root of 21576672 is about 278.3950355833.

The spelling of 21576672 in words is "twenty-one million, five hundred seventy-six thousand, six hundred seventy-two".