12021111111509 has 2 divisors, whose sum is σ = 12021111111510. Its totient is φ = 12021111111508.

The previous prime is 12021111111431. The next prime is 12021111111517. The reversal of 12021111111509 is 90511111112021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6436292890225 + 5584818221284 = 2536985^2 + 2363222^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021111111509 is a prime.

It is a super-2 number, since 2×12021111111509² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021111113509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010555555754 + 6010555555755.

It is an arithmetic number, because the mean of its divisors is an integer number (6010555555755).

Almost surely, 2^{12021111111509} is an apocalyptic number.

It is an amenable number.

12021111111509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021111111509 is an equidigital number, since it uses as much as digits as its factorization.

12021111111509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 26.

The spelling of 12021111111509 in words is "twelve trillion, twenty-one billion, one hundred eleven million, one hundred eleven thousand, five hundred nine".