12120021091 has 2 divisors, whose sum is σ = 12120021092. Its totient is φ = 12120021090.

The previous prime is 12120021077. The next prime is 12120021101. The reversal of 12120021091 is 19012002121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12120021091 - 2¹³ = 12120012899 is a prime.

It is a super-2 number, since 2×12120021091² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12120021041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060010545 + 6060010546.

It is an arithmetic number, because the mean of its divisors is an integer number (6060010546).

Almost surely, 2^12120021091 is an apocalyptic number.

12120021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12120021091 is an equidigital number, since it uses as much as digits as its factorization.

12120021091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 12120021091 in words is "twelve billion, one hundred twenty million, twenty-one thousand, ninety-one".