21364552 has 16 divisors (see below), whose sum is σ = 43700400. Its totient is φ = 9711120.

The previous prime is 21364547. The next prime is 21364591. The reversal of 21364552 is 25546312.

It is a self number, because there is not a number n which added to its sum of digits gives 21364552.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121302 + ... + 121477.

It is an arithmetic number, because the mean of its divisors is an integer number (2731275).

Almost surely, 2^21364552 is an apocalyptic number.

21364552 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21364552 is an abundant number, since it is smaller than the sum of its proper divisors (22335848).

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

21364552 is a wasteful number, since it uses less digits than its factorization.

21364552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242796 (or 242792 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 21364552 is about 4622.1804378453. The cubic root of 21364552 is about 277.4797301429.

It can be divided in two parts, 2 and 1364552, that multiplied together give a square (2729104 = 1652²).

The spelling of 21364552 in words is "twenty-one million, three hundred sixty-four thousand, five hundred fifty-two".