21101892 has 48 divisors (see below), whose sum is σ = 56568960. Its totient is φ = 5997312.

The previous prime is 21101887. The next prime is 21101903. The reversal of 21101892 is 29810112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18688 + ... + 19784.

It is an arithmetic number, because the mean of its divisors is an integer number (1178520).

Almost surely, 2^21101892 is an apocalyptic number.

It is an amenable number.

21101892 is an abundant number, since it is smaller than the sum of its proper divisors (35467068).

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

21101892 is a wasteful number, since it uses less digits than its factorization.

21101892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340 (or 1338 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 21101892 is about 4593.6795708887. The cubic root of 21101892 is about 276.3379079103.

The spelling of 21101892 in words is "twenty-one million, one hundred one thousand, eight hundred ninety-two".