11272019821 has 2 divisors, whose sum is σ = 11272019822. Its totient is φ = 11272019820.

The previous prime is 11272019789. The next prime is 11272019849. The reversal of 11272019821 is 12891027211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9897464196 + 1374555625 = 99486^2 + 37075^2 .

It is a cyclic number.

It is not a de Polignac number, because 11272019821 - 2⁵ = 11272019789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11272019621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5636009910 + 5636009911.

It is an arithmetic number, because the mean of its divisors is an integer number (5636009911).

Almost surely, 2^11272019821 is an apocalyptic number.

It is an amenable number.

11272019821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11272019821 is an equidigital number, since it uses as much as digits as its factorization.

11272019821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 11272019821 in words is "eleven billion, two hundred seventy-two million, nineteen thousand, eight hundred twenty-one".