121012211993 has 2 divisors, whose sum is σ = 121012211994. Its totient is φ = 121012211992.

The previous prime is 121012211899. The next prime is 121012212007. The reversal of 121012211993 is 399112210121.

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., 104233413904 + 16778798089 = 322852^2 + 129533^2 .

It is a cyclic number.

It is not a de Polignac number, because 121012211993 - 2⁸ = 121012211737 is a prime.

It is not a weakly prime, because it can be changed into another prime (121012211093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60506105996 + 60506105997.

It is an arithmetic number, because the mean of its divisors is an integer number (60506105997).

Almost surely, 2^121012211993 is an apocalyptic number.

It is an amenable number.

121012211993 is a deficient number, since it is larger than the sum of its proper divisors (1).

121012211993 is an equidigital number, since it uses as much as digits as its factorization.

121012211993 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 32.

The spelling of 121012211993 in words is "one hundred twenty-one billion, twelve million, two hundred eleven thousand, nine hundred ninety-three".