20121208039 has 2 divisors, whose sum is σ = 20121208040. Its totient is φ = 20121208038.

The previous prime is 20121208033. The next prime is 20121208057. The reversal of 20121208039 is 93080212102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121208039 - 2²³ = 20112819431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121207998 and 20121208016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121208033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060604019 + 10060604020.

It is an arithmetic number, because the mean of its divisors is an integer number (10060604020).

Almost surely, 2^20121208039 is an apocalyptic number.

20121208039 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121208039 is an equidigital number, since it uses as much as digits as its factorization.

20121208039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 20121208039 in words is "twenty billion, one hundred twenty-one million, two hundred eight thousand, thirty-nine".