21364201 has 4 divisors (see below), whose sum is σ = 21397572. Its totient is φ = 21330832.

The previous prime is 21364199. The next prime is 21364229. The reversal of 21364201 is 10246312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12960000 + 8404201 = 3600^2 + 2899^2 .

It is a cyclic number.

It is not a de Polignac number, because 21364201 - 2¹ = 21364199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21364001) 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, 15706 + ... + 17011.

It is an arithmetic number, because the mean of its divisors is an integer number (5349393).

Almost surely, 2^21364201 is an apocalyptic number.

It is an amenable number.

21364201 is a deficient number, since it is larger than the sum of its proper divisors (33371).

21364201 is an equidigital number, since it uses as much as digits as its factorization.

21364201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33370.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21364201 is about 4622.1424685961. The cubic root of 21364201 is about 277.4782105554.

The spelling of 21364201 in words is "twenty-one million, three hundred sixty-four thousand, two hundred one".