21364874 has 8 divisors (see below), whose sum is σ = 32251908. Its totient is φ = 10614240.

The previous prime is 21364853. The next prime is 21364877. The reversal of 21364874 is 47846312.

It can be written as a sum of positive squares in 2 ways, for example, as 20475625 + 889249 = 4525^2 + 943^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21364877) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 33707 + ... + 34334.

Almost surely, 2^21364874 is an apocalyptic number.

21364874 is a deficient number, since it is larger than the sum of its proper divisors (10887034).

21364874 is a wasteful number, since it uses less digits than its factorization.

21364874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68200.

The product of its digits is 32256, while the sum is 35.

The square root of 21364874 is about 4622.2152697597. The cubic root of 21364874 is about 277.4811241658.

The spelling of 21364874 in words is "twenty-one million, three hundred sixty-four thousand, eight hundred seventy-four".