11723306221 has 16 divisors (see below), whose sum is σ = 13156940160. Its totient is φ = 10354893120.

The previous prime is 11723306171. The next prime is 11723306237. The reversal of 11723306221 is 12260332711.

It is not a de Polignac number, because 11723306221 - 2⁷ = 11723306093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11723306221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11723301221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37566 + ... + 157663.

It is an arithmetic number, because the mean of its divisors is an integer number (822308760).

Almost surely, 2^11723306221 is an apocalyptic number.

11723306221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11723306221 is a deficient number, since it is larger than the sum of its proper divisors (1433633939).

11723306221 is a wasteful number, since it uses less digits than its factorization.

11723306221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195396.

The product of its (nonzero) digits is 3024, while the sum is 28.

Adding to 11723306221 its reverse (12260332711), we get a palindrome (23983638932).

The spelling of 11723306221 in words is "eleven billion, seven hundred twenty-three million, three hundred six thousand, two hundred twenty-one".