21193892 has 12 divisors (see below), whose sum is σ = 39041520. Its totient is φ = 10039176.

The previous prime is 21193891. The next prime is 21193897. The reversal of 21193892 is 29839112.

It is not an unprimeable number, because it can be changed into a prime (21193891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139358 + ... + 139509.

It is an arithmetic number, because the mean of its divisors is an integer number (3253460).

Almost surely, 2^21193892 is an apocalyptic number.

It is an amenable number.

21193892 is a deficient number, since it is larger than the sum of its proper divisors (17847628).

21193892 is a wasteful number, since it uses less digits than its factorization.

21193892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278890 (or 278888 counting only the distinct ones).

The product of its digits is 7776, while the sum is 35.

The square root of 21193892 is about 4603.6824390916. The cubic root of 21193892 is about 276.7389182438.

The spelling of 21193892 in words is "twenty-one million, one hundred ninety-three thousand, eight hundred ninety-two".