21799532 has 12 divisors (see below), whose sum is σ = 39464880. Its totient is φ = 10523856.

The previous prime is 21799529. The next prime is 21799553. The reversal of 21799532 is 23599712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93848 + ... + 94079.

It is an arithmetic number, because the mean of its divisors is an integer number (3288740).

Almost surely, 2^21799532 is an apocalyptic number.

It is an amenable number.

21799532 is a deficient number, since it is larger than the sum of its proper divisors (17665348).

21799532 is a wasteful number, since it uses less digits than its factorization.

21799532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187960 (or 187958 counting only the distinct ones).

The product of its digits is 34020, while the sum is 38.

The square root of 21799532 is about 4668.9968944089. The cubic root of 21799532 is about 279.3502450761.

It can be divided in two parts, 2179 and 9532, that added together give a palindrome (11711).

The spelling of 21799532 in words is "twenty-one million, seven hundred ninety-nine thousand, five hundred thirty-two".