12021121969 has 2 divisors, whose sum is σ = 12021121970. Its totient is φ = 12021121968.

The previous prime is 12021121961. The next prime is 12021121997. The reversal of 12021121969 is 96912112021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11889721600 + 131400369 = 109040^2 + 11463^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021121969 - 2³ = 12021121961 is a prime.

It is a super-2 number, since 2×12021121969² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12021121961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010560984 + 6010560985.

It is an arithmetic number, because the mean of its divisors is an integer number (6010560985).

Almost surely, 2^12021121969 is an apocalyptic number.

It is an amenable number.

12021121969 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021121969 is an equidigital number, since it uses as much as digits as its factorization.

12021121969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The spelling of 12021121969 in words is "twelve billion, twenty-one million, one hundred twenty-one thousand, nine hundred sixty-nine".