11465661437221 has 2 divisors, whose sum is σ = 11465661437222. Its totient is φ = 11465661437220.

The previous prime is 11465661437189. The next prime is 11465661437227. The reversal of 11465661437221 is 12273416656411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11462382156996 + 3279280225 = 3385614^2 + 57265^2 .

It is a cyclic number.

It is not a de Polignac number, because 11465661437221 - 2⁵ = 11465661437189 is a prime.

It is a super-2 number, since 2×11465661437221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11465661437227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5732830718610 + 5732830718611.

It is an arithmetic number, because the mean of its divisors is an integer number (5732830718611).

Almost surely, 2^{11465661437221} is an apocalyptic number.

It is an amenable number.

11465661437221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11465661437221 is an equidigital number, since it uses as much as digits as its factorization.

11465661437221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 49.

The spelling of 11465661437221 in words is "eleven trillion, four hundred sixty-five billion, six hundred sixty-one million, four hundred thirty-seven thousand, two hundred twenty-one".