21375201 has 4 divisors (see below), whose sum is σ = 28500272. Its totient is φ = 14250132.

The previous prime is 21375199. The next prime is 21375217. The reversal of 21375201 is 10257312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21375201 - 2¹ = 21375199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21375241) 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, 3562531 + ... + 3562536.

It is an arithmetic number, because the mean of its divisors is an integer number (7125068).

Almost surely, 2^21375201 is an apocalyptic number.

It is an amenable number.

21375201 is a deficient number, since it is larger than the sum of its proper divisors (7125071).

21375201 is an equidigital number, since it uses as much as digits as its factorization.

21375201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7125070.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 21375201 is about 4623.3322398461. The cubic root of 21375201 is about 277.5258250456.

The spelling of 21375201 in words is "twenty-one million, three hundred seventy-five thousand, two hundred one".