21374001 has 12 divisors (see below), whose sum is σ = 33680400. Its totient is φ = 12953880.

The previous prime is 21373991. The next prime is 21374011. The reversal of 21374001 is 10047312.

It is an interprime number because it is at equal distance from previous prime (21373991) and next prime (21374011).

It is not a de Polignac number, because 21374001 - 2⁹ = 21373489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21374011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107851 + ... + 108048.

It is an arithmetic number, because the mean of its divisors is an integer number (2806700).

Almost surely, 2^21374001 is an apocalyptic number.

It is an amenable number.

21374001 is a deficient number, since it is larger than the sum of its proper divisors (12306399).

21374001 is a wasteful number, since it uses less digits than its factorization.

21374001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215916 (or 215913 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21374001 is about 4623.2024614979. The cubic root of 21374001 is about 277.5206315315.

The spelling of 21374001 in words is "twenty-one million, three hundred seventy-four thousand, one".