11542001221 has 2 divisors, whose sum is σ = 11542001222. Its totient is φ = 11542001220.

The previous prime is 11542001213. The next prime is 11542001239. The reversal of 11542001221 is 12210024511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9003352996 + 2538648225 = 94886^2 + 50385^2 .

It is a cyclic number.

It is not a de Polignac number, because 11542001221 - 2³ = 11542001213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11542001021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5771000610 + 5771000611.

It is an arithmetic number, because the mean of its divisors is an integer number (5771000611).

Almost surely, 2^11542001221 is an apocalyptic number.

It is an amenable number.

11542001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11542001221 is an equidigital number, since it uses as much as digits as its factorization.

11542001221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 11542001221 its reverse (12210024511), we get a palindrome (23752025732).

The spelling of 11542001221 in words is "eleven billion, five hundred forty-two million, one thousand, two hundred twenty-one".