21469201 has 4 divisors (see below), whose sum is σ = 23120692. Its totient is φ = 19817712.

The previous prime is 21469163. The next prime is 21469207. The reversal of 21469201 is 10296412.

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 10240000 + 11229201 = 3200^2 + 3351^2 .

It is a cyclic number.

It is not a de Polignac number, because 21469201 - 2⁷ = 21469073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21469207) 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, 825726 + ... + 825751.

It is an arithmetic number, because the mean of its divisors is an integer number (5780173).

Almost surely, 2^21469201 is an apocalyptic number.

It is an amenable number.

21469201 is a deficient number, since it is larger than the sum of its proper divisors (1651491).

21469201 is a wasteful number, since it uses less digits than its factorization.

21469201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651490.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21469201 is about 4633.4869159198. The cubic root of 21469201 is about 277.9320478120.

The spelling of 21469201 in words is "twenty-one million, four hundred sixty-nine thousand, two hundred one".