12111019447921 has 9 divisors (see below), whose sum is σ = 12138955648833. Its totient is φ = 12083147415120.

The previous prime is 12111019447871. The next prime is 12111019447937. The reversal of 12111019447921 is 12974491011121.

The square root of 12111019447921 is 3480089.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 407504766321 + 11703514681600 = 638361^2 + 3421040^2 .

It is not a de Polignac number, because 12111019447921 - 2⁹ = 12111019447409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111019447721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1604317255 + ... + 1604324803.

Almost surely, 2^{12111019447921} is an apocalyptic number.

12111019447921 is the 3480089-th square number.

12111019447921 is the 1740045-th centered octagonal number.

It is an amenable number.

12111019447921 is a deficient number, since it is larger than the sum of its proper divisors (27936200912).

12111019447921 is an frugal number, since it uses more digits than its factorization.

12111019447921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16020 (or 8010 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 43.

The spelling of 12111019447921 in words is "twelve trillion, one hundred eleven billion, nineteen million, four hundred forty-seven thousand, nine hundred twenty-one".