21374205 has 8 divisors (see below), whose sum is σ = 34198752. Its totient is φ = 11399568.

The previous prime is 21374203. The next prime is 21374209. The reversal of 21374205 is 50247312.

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

It is not a de Polignac number, because 21374205 - 2¹ = 21374203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374203) 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, 712459 + ... + 712488.

It is an arithmetic number, because the mean of its divisors is an integer number (4274844).

Almost surely, 2^21374205 is an apocalyptic number.

It is an amenable number.

21374205 is a deficient number, since it is larger than the sum of its proper divisors (12824547).

21374205 is a wasteful number, since it uses less digits than its factorization.

21374205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424955.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21374205 is about 4623.2245240741. The cubic root of 21374205 is about 277.5215144427.

The spelling of 21374205 in words is "twenty-one million, three hundred seventy-four thousand, two hundred five".