121221001939 has 2 divisors, whose sum is σ = 121221001940. Its totient is φ = 121221001938.

The previous prime is 121221001883. The next prime is 121221002069. The reversal of 121221001939 is 939100122121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121221001939 - 2⁹ = 121221001427 is a prime.

It is a super-2 number, since 2×121221001939² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121221001939.

It is not a weakly prime, because it can be changed into another prime (121221004939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610500969 + 60610500970.

It is an arithmetic number, because the mean of its divisors is an integer number (60610500970).

Almost surely, 2^121221001939 is an apocalyptic number.

121221001939 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221001939 is an equidigital number, since it uses as much as digits as its factorization.

121221001939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 121221001939 in words is "one hundred twenty-one billion, two hundred twenty-one million, one thousand, nine hundred thirty-nine".