11721201 has 4 divisors (see below), whose sum is σ = 15628272. Its totient is φ = 7814132.

The previous prime is 11721187. The next prime is 11721209. The reversal of 11721201 is 10212711.

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 11721201 - 2⁵ = 11721169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11721209) 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, 1953531 + ... + 1953536.

It is an arithmetic number, because the mean of its divisors is an integer number (3907068).

Almost surely, 2^11721201 is an apocalyptic number.

It is an amenable number.

11721201 is a deficient number, since it is larger than the sum of its proper divisors (3907071).

11721201 is an equidigital number, since it uses as much as digits as its factorization.

11721201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3907070.

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 11721201 is about 3423.6239571542. The cubic root of 11721201 is about 227.1559086004.

Adding to 11721201 its reverse (10212711), we get a palindrome (21933912).

The spelling of 11721201 in words is "eleven million, seven hundred twenty-one thousand, two hundred one".