20121308899 has 2 divisors, whose sum is σ = 20121308900. Its totient is φ = 20121308898.

The previous prime is 20121308887. The next prime is 20121308941. The reversal of 20121308899 is 99880312102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121308899 - 2⁷ = 20121308771 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121308399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060654449 + 10060654450.

It is an arithmetic number, because the mean of its divisors is an integer number (10060654450).

Almost surely, 2^20121308899 is an apocalyptic number.

20121308899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121308899 is an equidigital number, since it uses as much as digits as its factorization.

20121308899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 20121308899 in words is "twenty billion, one hundred twenty-one million, three hundred eight thousand, eight hundred ninety-nine".