11615249221 has 2 divisors, whose sum is σ = 11615249222. Its totient is φ = 11615249220.

The previous prime is 11615249213. The next prime is 11615249227. The reversal of 11615249221 is 12294251611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11153472100 + 461777121 = 105610^2 + 21489^2 .

It is a cyclic number.

It is not a de Polignac number, because 11615249221 - 2³ = 11615249213 is a prime.

It is a super-2 number, since 2×11615249221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11615249227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5807624610 + 5807624611.

It is an arithmetic number, because the mean of its divisors is an integer number (5807624611).

Almost surely, 2^11615249221 is an apocalyptic number.

It is an amenable number.

11615249221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11615249221 is an equidigital number, since it uses as much as digits as its factorization.

11615249221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The spelling of 11615249221 in words is "eleven billion, six hundred fifteen million, two hundred forty-nine thousand, two hundred twenty-one".