121221020199 has 16 divisors (see below), whose sum is σ = 175115457792. Its totient is φ = 74291403648.

The previous prime is 121221020189. The next prime is 121221020203. The reversal of 121221020199 is 991020122121.

It is not a de Polignac number, because 121221020199 - 2⁸ = 121221019943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221020189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27635979 + ... + 27640364.

It is an arithmetic number, because the mean of its divisors is an integer number (10944716112).

Almost surely, 2^121221020199 is an apocalyptic number.

121221020199 is a deficient number, since it is larger than the sum of its proper divisors (53894437593).

121221020199 is a wasteful number, since it uses less digits than its factorization.

121221020199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55276406.

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 121221020199 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty thousand, one hundred ninety-nine".