121022201999 has 4 divisors (see below), whose sum is σ = 122269853664. Its totient is φ = 119774550336.

The previous prime is 121022201981. The next prime is 121022202013. The reversal of 121022201999 is 999102220121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999102220121 = 1051 ⋅950620571.

It is a cyclic number.

It is not a de Polignac number, because 121022201999 - 2⁸ = 121022201743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121028201999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623825687 + ... + 623825880.

It is an arithmetic number, because the mean of its divisors is an integer number (30567463416).

Almost surely, 2^121022201999 is an apocalyptic number.

121022201999 is a deficient number, since it is larger than the sum of its proper divisors (1247651665).

121022201999 is an equidigital number, since it uses as much as digits as its factorization.

121022201999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247651664.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 121022201999 in words is "one hundred twenty-one billion, twenty-two million, two hundred one thousand, nine hundred ninety-nine".