121438271939 has 2 divisors, whose sum is σ = 121438271940. Its totient is φ = 121438271938.

The previous prime is 121438271921. The next prime is 121438271959. The reversal of 121438271939 is 939172834121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121438271939 - 2¹⁶ = 121438206403 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (121438271959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60719135969 + 60719135970.

It is an arithmetic number, because the mean of its divisors is an integer number (60719135970).

Almost surely, 2^121438271939 is an apocalyptic number.

121438271939 is a deficient number, since it is larger than the sum of its proper divisors (1).

121438271939 is an equidigital number, since it uses as much as digits as its factorization.

121438271939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The spelling of 121438271939 in words is "one hundred twenty-one billion, four hundred thirty-eight million, two hundred seventy-one thousand, nine hundred thirty-nine".