21100432 has 20 divisors (see below), whose sum is σ = 41198256. Its totient is φ = 10468640.

The previous prime is 21100423. The next prime is 21100441. The reversal of 21100432 is 23400112.

It is an interprime number because it is at equal distance from previous prime (21100423) and next prime (21100441).

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, 2938 + ... + 7129.

Almost surely, 2^21100432 is an apocalyptic number.

It is an amenable number.

21100432 is a deficient number, since it is larger than the sum of its proper divisors (20097824).

21100432 is a wasteful number, since it uses less digits than its factorization.

21100432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10206 (or 10200 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21100432 is about 4593.5206541388. The cubic root of 21100432 is about 276.3315346642.

Adding to 21100432 its reverse (23400112), we get a palindrome (44500544).

The spelling of 21100432 in words is "twenty-one million, one hundred thousand, four hundred thirty-two".