11544222821 has 6 divisors (see below), whose sum is σ = 11956027122. Its totient is φ = 11146145360.

The previous prime is 11544222797. The next prime is 11544222869. The reversal of 11544222821 is 12822244511.

It can be written as a sum of positive squares in 3 ways, for example, as 2762658721 + 8781564100 = 52561^2 + 93710^2 .

It is not a de Polignac number, because 11544222821 - 2²⁶ = 11477113957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11544222871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6862550 + ... + 6864231.

It is an arithmetic number, because the mean of its divisors is an integer number (1992671187).

Almost surely, 2^11544222821 is an apocalyptic number.

It is an amenable number.

11544222821 is a deficient number, since it is larger than the sum of its proper divisors (411804301).

11544222821 is an equidigital number, since it uses as much as digits as its factorization.

11544222821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13726839 (or 13726810 counting only the distinct ones).

The product of its digits is 10240, while the sum is 32.

The spelling of 11544222821 in words is "eleven billion, five hundred forty-four million, two hundred twenty-two thousand, eight hundred twenty-one".