21354268 has 12 divisors (see below), whose sum is σ = 40244680. Its totient is φ = 9855792.

The previous prime is 21354251. The next prime is 21354293. The reversal of 21354268 is 86245312.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 205278 + ... + 205381.

Almost surely, 2^21354268 is an apocalyptic number.

It is an amenable number.

21354268 is a deficient number, since it is larger than the sum of its proper divisors (18890412).

21354268 is a wasteful number, since it uses less digits than its factorization.

21354268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410676 (or 410674 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 21354268 is about 4621.0678419603. The cubic root of 21354268 is about 277.4352006261.

The spelling of 21354268 in words is "twenty-one million, three hundred fifty-four thousand, two hundred sixty-eight".