11937242221 has 2 divisors, whose sum is σ = 11937242222. Its totient is φ = 11937242220.

The previous prime is 11937242197. The next prime is 11937242237. The reversal of 11937242221 is 12224273911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11275466596 + 661775625 = 106186^2 + 25725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11937242221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11937942221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5968621110 + 5968621111.

It is an arithmetic number, because the mean of its divisors is an integer number (5968621111).

Almost surely, 2^11937242221 is an apocalyptic number.

It is an amenable number.

11937242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11937242221 is an equidigital number, since it uses as much as digits as its factorization.

11937242221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The spelling of 11937242221 in words is "eleven billion, nine hundred thirty-seven million, two hundred forty-two thousand, two hundred twenty-one".