21763672 has 32 divisors (see below), whose sum is σ = 49381920. Its totient is φ = 8778240.

The previous prime is 21763669. The next prime is 21763673. The reversal of 21763672 is 27636712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21763673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10479 + ... + 12382.

It is an arithmetic number, because the mean of its divisors is an integer number (1543185).

Almost surely, 2^21763672 is an apocalyptic number.

It is an amenable number.

21763672 is an abundant number, since it is smaller than the sum of its proper divisors (27618248).

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

21763672 is a wasteful number, since it uses less digits than its factorization.

21763672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22891 (or 22887 counting only the distinct ones).

The product of its digits is 21168, while the sum is 34.

The square root of 21763672 is about 4665.1550885260. The cubic root of 21763672 is about 279.1969849402.

The spelling of 21763672 in words is "twenty-one million, seven hundred sixty-three thousand, six hundred seventy-two".