21353492 has 12 divisors (see below), whose sum is σ = 39335520. Its totient is φ = 10114776.

The previous prime is 21353491. The next prime is 21353531. The reversal of 21353492 is 29435312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353491) 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, 140408 + ... + 140559.

It is an arithmetic number, because the mean of its divisors is an integer number (3277960).

Almost surely, 2^21353492 is an apocalyptic number.

It is an amenable number.

21353492 is a deficient number, since it is larger than the sum of its proper divisors (17982028).

21353492 is a wasteful number, since it uses less digits than its factorization.

21353492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280990 (or 280988 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 21353492 is about 4620.9838779204. The cubic root of 21353492 is about 277.4318399814.

The spelling of 21353492 in words is "twenty-one million, three hundred fifty-three thousand, four hundred ninety-two".