21374633 has 6 divisors (see below), whose sum is σ = 24864426. Its totient is φ = 18321072.

The previous prime is 21374611. The next prime is 21374657. The reversal of 21374633 is 33647312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21279769 + 94864 = 4613^2 + 308^2 .

It is not a de Polignac number, because 21374633 - 2⁸ = 21374377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21374596 and 21374605.

It is not an unprimeable number, because it can be changed into a prime (21374693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218060 + ... + 218157.

It is an arithmetic number, because the mean of its divisors is an integer number (4144071).

Almost surely, 2^21374633 is an apocalyptic number.

It is an amenable number.

21374633 is a deficient number, since it is larger than the sum of its proper divisors (3489793).

21374633 is an equidigital number, since it uses as much as digits as its factorization.

21374633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436231 (or 436224 counting only the distinct ones).

The product of its digits is 9072, while the sum is 29.

The square root of 21374633 is about 4623.2708118820. The cubic root of 21374633 is about 277.5233668065.

The spelling of 21374633 in words is "twenty-one million, three hundred seventy-four thousand, six hundred thirty-three".