21899752 has 16 divisors (see below), whose sum is σ = 46928160. Its totient is φ = 9385584.

The previous prime is 21899743. The next prime is 21899777. The reversal of 21899752 is 25799812.

It is a junction number, because it is equal to n+sod(n) for n = 21899699 and 21899708.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195478 + ... + 195589.

It is an arithmetic number, because the mean of its divisors is an integer number (2933010).

Almost surely, 2^21899752 is an apocalyptic number.

It is an amenable number.

21899752 is an abundant number, since it is smaller than the sum of its proper divisors (25028408).

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

21899752 is a wasteful number, since it uses less digits than its factorization.

21899752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391080 (or 391076 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 21899752 is about 4679.7170854657. The cubic root of 21899752 is about 279.7776806686. Note that the first 3 decimals are identical.

The spelling of 21899752 in words is "twenty-one million, eight hundred ninety-nine thousand, seven hundred fifty-two".