11540520221 has 2 divisors, whose sum is σ = 11540520222. Its totient is φ = 11540520220.

The previous prime is 11540520149. The next prime is 11540520259. The reversal of 11540520221 is 12202504511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10375663321 + 1164856900 = 101861^2 + 34130^2 .

It is a cyclic number.

It is not a de Polignac number, because 11540520221 - 2¹⁰ = 11540519197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11542520221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5770260110 + 5770260111.

It is an arithmetic number, because the mean of its divisors is an integer number (5770260111).

Almost surely, 2^11540520221 is an apocalyptic number.

It is an amenable number.

11540520221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11540520221 is an equidigital number, since it uses as much as digits as its factorization.

11540520221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 23.

The spelling of 11540520221 in words is "eleven billion, five hundred forty million, five hundred twenty thousand, two hundred twenty-one".