21474752 has 56 divisors (see below), whose sum is σ = 46853856. Its totient is φ = 9704448.

The previous prime is 21474751. The next prime is 21474781. The reversal of 21474752 is 25747412.

It is a super-2 number, since 2×21474752² = 922329946923008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21474751) 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, 43853 + ... + 44339.

It is an arithmetic number, because the mean of its divisors is an integer number (836676).

Almost surely, 2^21474752 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 21474752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23426928).

21474752 is an abundant number, since it is smaller than the sum of its proper divisors (25379104).

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

21474752 is a wasteful number, since it uses less digits than its factorization.

21474752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 555 counting only the distinct ones).

The product of its digits is 15680, while the sum is 32.

The square root of 21474752 is about 4634.0858861268. The cubic root of 21474752 is about 277.9559994541.

The spelling of 21474752 in words is "twenty-one million, four hundred seventy-four thousand, seven hundred fifty-two".