20121323149 has 2 divisors, whose sum is σ = 20121323150. Its totient is φ = 20121323148.

The previous prime is 20121323093. The next prime is 20121323179. The reversal of 20121323149 is 94132312102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17113349124 + 3007974025 = 130818^2 + 54845^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121323149 - 2⁷ = 20121323021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121323179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060661574 + 10060661575.

It is an arithmetic number, because the mean of its divisors is an integer number (10060661575).

Almost surely, 2^20121323149 is an apocalyptic number.

It is an amenable number.

20121323149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121323149 is an equidigital number, since it uses as much as digits as its factorization.

20121323149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 20121323149 in words is "twenty billion, one hundred twenty-one million, three hundred twenty-three thousand, one hundred forty-nine".