21602201 has 4 divisors (see below), whose sum is σ = 21968400. Its totient is φ = 21236004.

The previous prime is 21602197. The next prime is 21602237. The reversal of 21602201 is 10220612.

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 a cyclic number.

It is not a de Polignac number, because 21602201 - 2² = 21602197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21602261) 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, 183011 + ... + 183128.

It is an arithmetic number, because the mean of its divisors is an integer number (5492100).

Almost surely, 2^21602201 is an apocalyptic number.

It is an amenable number.

21602201 is a deficient number, since it is larger than the sum of its proper divisors (366199).

21602201 is an equidigital number, since it uses as much as digits as its factorization.

21602201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366198.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21602201 is about 4647.8167993156. The cubic root of 21602201 is about 278.5047890816.

Adding to 21602201 its reverse (10220612), we get a palindrome (31822813).

The spelling of 21602201 in words is "twenty-one million, six hundred two thousand, two hundred one".