21998632 has 32 divisors (see below), whose sum is σ = 43182720. Its totient is φ = 10495360.

The previous prime is 21998621. The next prime is 21998633. The reversal of 21998632 is 23689912.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21998633) 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, 14703 + ... + 16129.

It is an arithmetic number, because the mean of its divisors is an integer number (1349460).

Almost surely, 2^21998632 is an apocalyptic number.

It is an amenable number.

21998632 is a deficient number, since it is larger than the sum of its proper divisors (21184088).

21998632 is a wasteful number, since it uses less digits than its factorization.

21998632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521 (or 1517 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 21998632 is about 4690.2699282664. The cubic root of 21998632 is about 280.1981250818.

The spelling of 21998632 in words is "twenty-one million, nine hundred ninety-eight thousand, six hundred thirty-two".