1232197721 has 4 divisors (see below), whose sum is σ = 1237353600. Its totient is φ = 1227041844.

The previous prime is 1232197711. The next prime is 1232197741. The reversal of 1232197721 is 1277912321.

It is a happy number.

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 1232197721 - 2⁶ = 1232197657 is a prime.

It is a super-2 number, since 2×1232197721² = 3036622447275187682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1232197711) 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, 2577581 + ... + 2578058.

It is an arithmetic number, because the mean of its divisors is an integer number (309338400).

Almost surely, 2^1232197721 is an apocalyptic number.

It is an amenable number.

1232197721 is a deficient number, since it is larger than the sum of its proper divisors (5155879).

1232197721 is an equidigital number, since it uses as much as digits as its factorization.

1232197721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5155878.

The product of its digits is 10584, while the sum is 35.

The square root of 1232197721 is about 35102.6739864643. The cubic root of 1232197721 is about 1072.0790279347.

The spelling of 1232197721 in words is "one billion, two hundred thirty-two million, one hundred ninety-seven thousand, seven hundred twenty-one".