21747652 has 12 divisors (see below), whose sum is σ = 38868480. Its totient is φ = 10642376.

The previous prime is 21747631. The next prime is 21747653. The reversal of 21747652 is 25674712.

It is not an unprimeable number, because it can be changed into a prime (21747653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57652 + ... + 58027.

It is an arithmetic number, because the mean of its divisors is an integer number (3239040).

Almost surely, 2^21747652 is an apocalyptic number.

It is an amenable number.

21747652 is a deficient number, since it is larger than the sum of its proper divisors (17120828).

21747652 is a wasteful number, since it uses less digits than its factorization.

21747652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115730 (or 115728 counting only the distinct ones).

The product of its digits is 23520, while the sum is 34.

The square root of 21747652 is about 4663.4377877270. The cubic root of 21747652 is about 279.1284635131.

The spelling of 21747652 in words is "twenty-one million, seven hundred forty-seven thousand, six hundred fifty-two".