21364356 has 24 divisors (see below), whose sum is σ = 53685184. Its totient is φ = 6573600.

The previous prime is 21364351. The next prime is 21364373. The reversal of 21364356 is 65346312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364351) 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, 68320 + ... + 68631.

Almost surely, 2^21364356 is an apocalyptic number.

21364356 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21364356 is an abundant number, since it is smaller than the sum of its proper divisors (32320828).

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

21364356 is a wasteful number, since it uses less digits than its factorization.

21364356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136971 (or 136969 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 21364356 is about 4622.1592356820. The cubic root of 21364356 is about 277.4788816004.

The spelling of 21364356 in words is "twenty-one million, three hundred sixty-four thousand, three hundred fifty-six".