21764652 has 96 divisors (see below), whose sum is σ = 65856000. Its totient is φ = 5432832.

The previous prime is 21764651. The next prime is 21764653. The reversal of 21764652 is 25646712.

It is an interprime number because it is at equal distance from previous prime (21764651) and next prime (21764653).

It is a super-2 number, since 2×21764652² = 947400153362208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21764651) 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, 20224 + ... + 21272.

It is an arithmetic number, because the mean of its divisors is an integer number (686000).

Almost surely, 2^21764652 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 21764652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32928000).

21764652 is an abundant number, since it is smaller than the sum of its proper divisors (44091348).

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

21764652 is a wasteful number, since it uses less digits than its factorization.

21764652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095 (or 1093 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 21764652 is about 4665.2601213652. The cubic root of 21764652 is about 279.2011755464.

The spelling of 21764652 in words is "twenty-one million, seven hundred sixty-four thousand, six hundred fifty-two".