21145392 has 30 divisors (see below), whose sum is σ = 59178132. Its totient is φ = 7048416.

The previous prime is 21145367. The next prime is 21145393. The reversal of 21145392 is 29354112.

It is not an unprimeable number, because it can be changed into a prime (21145393) 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, 73278 + ... + 73565.

Almost surely, 2^21145392 is an apocalyptic number.

It is an amenable number.

21145392 is an abundant number, since it is smaller than the sum of its proper divisors (38032740).

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

21145392 is a wasteful number, since it uses less digits than its factorization.

21145392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146857 (or 146848 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 21145392 is about 4598.4118997758. The cubic root of 21145392 is about 276.5276610141.

The spelling of 21145392 in words is "twenty-one million, one hundred forty-five thousand, three hundred ninety-two".