21732201 has 6 divisors (see below), whose sum is σ = 31390970. Its totient is φ = 14488128.

The previous prime is 21732197. The next prime is 21732203. The reversal of 21732201 is 10223712.

It can be written as a sum of positive squares in only one way, i.e., 20466576 + 1265625 = 4524^2 + 1125^2 .

It is not a de Polignac number, because 21732201 - 2² = 21732197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21732203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1207336 + ... + 1207353.

Almost surely, 2^21732201 is an apocalyptic number.

It is an amenable number.

21732201 is a deficient number, since it is larger than the sum of its proper divisors (9658769).

21732201 is a wasteful number, since it uses less digits than its factorization.

21732201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414695 (or 2414692 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21732201 is about 4661.7808828816. The cubic root of 21732201 is about 279.0623439513.

Adding to 21732201 its reverse (10223712), we get a palindrome (31955913).

The spelling of 21732201 in words is "twenty-one million, seven hundred thirty-two thousand, two hundred one".