21374207 has 4 divisors (see below), whose sum is σ = 21403056. Its totient is φ = 21345360.

The previous prime is 21374203. The next prime is 21374209. The reversal of 21374207 is 70247312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21374207 - 2² = 21374203 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13283 + ... + 14804.

It is an arithmetic number, because the mean of its divisors is an integer number (5350764).

Almost surely, 2^21374207 is an apocalyptic number.

21374207 is a deficient number, since it is larger than the sum of its proper divisors (28849).

21374207 is an equidigital number, since it uses as much as digits as its factorization.

21374207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28848.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 21374207 is about 4623.2247403733. The cubic root of 21374207 is about 277.5215230986.

The spelling of 21374207 in words is "twenty-one million, three hundred seventy-four thousand, two hundred seven".