21157112 has 24 divisors (see below), whose sum is σ = 42144960. Its totient is φ = 9955200.

The previous prime is 21157111. The next prime is 21157117. The reversal of 21157112 is 21175112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21157111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2264 + ... + 6887.

It is an arithmetic number, because the mean of its divisors is an integer number (1756040).

Almost surely, 2^21157112 is an apocalyptic number.

It is an amenable number.

21157112 is a deficient number, since it is larger than the sum of its proper divisors (20987848).

21157112 is a wasteful number, since it uses less digits than its factorization.

21157112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9191 (or 9170 counting only the distinct ones).

The product of its digits is 140, while the sum is 20.

The square root of 21157112 is about 4599.6860762448. The cubic root of 21157112 is about 276.5787407893.

The spelling of 21157112 in words is "twenty-one million, one hundred fifty-seven thousand, one hundred twelve".