21169201 has 9 divisors (see below), whose sum is σ = 21877401. Its totient is φ = 20483652.

The previous prime is 21169157. The next prime is 21169219. The reversal of 21169201 is 10296112.

The square root of 21169201 is 4601.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 21169201 - 2⁷ = 21169073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21169241) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 197790 + ... + 197896.

Almost surely, 2^21169201 is an apocalyptic number.

21169201 is the 4601-st square number.

21169201 is the 2301-st centered octagonal number.

It is an amenable number.

21169201 is a deficient number, since it is larger than the sum of its proper divisors (708200).

21169201 is an frugal number, since it uses more digits than its factorization.

21169201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The cubic root of 21169201 is about 276.6314090326.

The spelling of 21169201 in words is "twenty-one million, one hundred sixty-nine thousand, two hundred one".