11221619391 has 10 divisors (see below), whose sum is σ = 16763159952. Its totient is φ = 7481079540.

The previous prime is 11221619389. The next prime is 11221619441. The reversal of 11221619391 is 19391612211.

11221619391 is a `hidden beast` number, since 1 + 1 + 2 + 2 + 1 + 619 + 39 + 1 = 666.

It is not a de Polignac number, because 11221619391 - 2¹ = 11221619389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221619491) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 69269175 + ... + 69269336.

Almost surely, 2^11221619391 is an apocalyptic number.

11221619391 is a deficient number, since it is larger than the sum of its proper divisors (5541540561).

11221619391 is an equidigital number, since it uses as much as digits as its factorization.

11221619391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138538523 (or 138538514 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The spelling of 11221619391 in words is "eleven billion, two hundred twenty-one million, six hundred nineteen thousand, three hundred ninety-one".