121021020199 has 2 divisors, whose sum is σ = 121021020200. Its totient is φ = 121021020198.

The previous prime is 121021020191. The next prime is 121021020203. The reversal of 121021020199 is 991020120121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121021020199 - 2³ = 121021020191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121021020191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510510099 + 60510510100.

It is an arithmetic number, because the mean of its divisors is an integer number (60510510100).

Almost surely, 2^121021020199 is an apocalyptic number.

121021020199 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021020199 is an equidigital number, since it uses as much as digits as its factorization.

121021020199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

It can be divided in two parts, 12102 and 1020199, that added together give a palindrome (1032301).

The spelling of 121021020199 in words is "one hundred twenty-one billion, twenty-one million, twenty thousand, one hundred ninety-nine".