121221110099 has 4 divisors (see below), whose sum is σ = 121532732880. Its totient is φ = 120909487320.

The previous prime is 121221110039. The next prime is 121221110107. The reversal of 121221110099 is 990011122121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221110099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221110009) 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, 155810807 + ... + 155811584.

It is an arithmetic number, because the mean of its divisors is an integer number (30383183220).

Almost surely, 2^121221110099 is an apocalyptic number.

121221110099 is a deficient number, since it is larger than the sum of its proper divisors (311622781).

121221110099 is an equidigital number, since it uses as much as digits as its factorization.

121221110099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311622780.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 121221110099 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred ten thousand, ninety-nine".