21465201 has 4 divisors (see below), whose sum is σ = 28620272. Its totient is φ = 14310132.

The previous prime is 21465173. The next prime is 21465209. The reversal of 21465201 is 10256412.

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 21465201 - 2⁶ = 21465137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21465209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3577531 + ... + 3577536.

It is an arithmetic number, because the mean of its divisors is an integer number (7155068).

Almost surely, 2^21465201 is an apocalyptic number.

It is an amenable number.

21465201 is a deficient number, since it is larger than the sum of its proper divisors (7155071).

21465201 is an equidigital number, since it uses as much as digits as its factorization.

21465201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7155070.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21465201 is about 4633.0552554443. The cubic root of 21465201 is about 277.9147859176.

The spelling of 21465201 in words is "twenty-one million, four hundred sixty-five thousand, two hundred one".