11864712221 has 2 divisors, whose sum is σ = 11864712222. Its totient is φ = 11864712220.

The previous prime is 11864712179. The next prime is 11864712247. The reversal of 11864712221 is 12221746811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10238606596 + 1626105625 = 101186^2 + 40325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11864712221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11864712121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5932356110 + 5932356111.

It is an arithmetic number, because the mean of its divisors is an integer number (5932356111).

Almost surely, 2^11864712221 is an apocalyptic number.

It is an amenable number.

11864712221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11864712221 is an equidigital number, since it uses as much as digits as its factorization.

11864712221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 35.

The spelling of 11864712221 in words is "eleven billion, eight hundred sixty-four million, seven hundred twelve thousand, two hundred twenty-one".