21264354 has 24 divisors (see below), whose sum is σ = 46319052. Its totient is φ = 7050240.

The previous prime is 21264349. The next prime is 21264361. The reversal of 21264354 is 45346212.

21264354 is a `hidden beast` number, since 2 + 12 + 643 + 5 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18688329 + 2576025 = 4323^2 + 1605^2 .

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 11 ways as a sum of consecutive naturals, for example, 414 + ... + 6534.

Almost surely, 2^21264354 is an apocalyptic number.

21264354 is an abundant number, since it is smaller than the sum of its proper divisors (25054698).

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

21264354 is a wasteful number, since it uses less digits than its factorization.

21264354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6322 (or 6319 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 21264354 is about 4611.3288757147. The cubic root of 21264354 is about 277.0452644906.

The spelling of 21264354 in words is "twenty-one million, two hundred sixty-four thousand, three hundred fifty-four".