21927672 has 160 divisors (see below), whose sum is σ = 70131600. Its totient is φ = 6345216.

The previous prime is 21927641. The next prime is 21927673. The reversal of 21927672 is 27672912.

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 (21927673) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 159988 + ... + 160124.

Almost surely, 2^21927672 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 21927672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35065800).

21927672 is an abundant number, since it is smaller than the sum of its proper divisors (48203928).

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

21927672 is a wasteful number, since it uses less digits than its factorization.

21927672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 174 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 21927672 is about 4682.6992216029. The cubic root of 21927672 is about 279.8965263920.

The spelling of 21927672 in words is "twenty-one million, nine hundred twenty-seven thousand, six hundred seventy-two".