121210201993 has 2 divisors, whose sum is σ = 121210201994. Its totient is φ = 121210201992.

The previous prime is 121210201969. The next prime is 121210201997. The reversal of 121210201993 is 399102012121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118729863184 + 2480338809 = 344572^2 + 49803^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210201993 - 2²⁹ = 120673331081 is a prime.

It is a super-2 number, since 2×121210201993² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121210201997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605100996 + 60605100997.

It is an arithmetic number, because the mean of its divisors is an integer number (60605100997).

Almost surely, 2^121210201993 is an apocalyptic number.

It is an amenable number.

121210201993 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210201993 is an equidigital number, since it uses as much as digits as its factorization.

121210201993 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 121210201993 in words is "one hundred twenty-one billion, two hundred ten million, two hundred one thousand, nine hundred ninety-three".