21364755 has 8 divisors (see below), whose sum is σ = 34183632. Its totient is φ = 11394528.

The previous prime is 21364747. The next prime is 21364771. The reversal of 21364755 is 55746312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21364755 - 2³ = 21364747 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712144 + ... + 712173.

It is an arithmetic number, because the mean of its divisors is an integer number (4272954).

Almost surely, 2^21364755 is an apocalyptic number.

21364755 is a deficient number, since it is larger than the sum of its proper divisors (12818877).

21364755 is a wasteful number, since it uses less digits than its factorization.

21364755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424325.

The product of its digits is 25200, while the sum is 33.

The square root of 21364755 is about 4622.2023971263. The cubic root of 21364755 is about 277.4806089851.

The spelling of 21364755 in words is "twenty-one million, three hundred sixty-four thousand, seven hundred fifty-five".