12021031291 has 2 divisors, whose sum is σ = 12021031292. Its totient is φ = 12021031290.

The previous prime is 12021031273. The next prime is 12021031357. The reversal of 12021031291 is 19213012021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12021031291 - 2⁹ = 12021030779 is a prime.

It is a super-2 number, since 2×12021031291² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12021031271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010515645 + 6010515646.

It is an arithmetic number, because the mean of its divisors is an integer number (6010515646).

Almost surely, 2^12021031291 is an apocalyptic number.

12021031291 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021031291 is an equidigital number, since it uses as much as digits as its factorization.

12021031291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 12021031291 in words is "twelve billion, twenty-one million, thirty-one thousand, two hundred ninety-one".