21354292 has 24 divisors (see below), whose sum is σ = 38024000. Its totient is φ = 10492416.

The previous prime is 21354251. The next prime is 21354293. The reversal of 21354292 is 29245312.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 21354292.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107209 + ... + 107407.

Almost surely, 2^21354292 is an apocalyptic number.

It is an amenable number.

21354292 is a deficient number, since it is larger than the sum of its proper divisors (16669708).

21354292 is a wasteful number, since it uses less digits than its factorization.

21354292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 533 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 21354292 is about 4621.0704387620. The cubic root of 21354292 is about 277.4353045623.

The spelling of 21354292 in words is "twenty-one million, three hundred fifty-four thousand, two hundred ninety-two".