121221100993 has 4 divisors (see below), whose sum is σ = 127601158960. Its totient is φ = 114841043028.

The previous prime is 121221100969. The next prime is 121221101003. The reversal of 121221100993 is 399001122121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121221100993 - 2¹³ = 121221092801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221100933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3190028955 + ... + 3190028992.

It is an arithmetic number, because the mean of its divisors is an integer number (31900289740).

Almost surely, 2^121221100993 is an apocalyptic number.

It is an amenable number.

121221100993 is a deficient number, since it is larger than the sum of its proper divisors (6380057967).

121221100993 is an equidigital number, since it uses as much as digits as its factorization.

121221100993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6380057966.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 121221100993 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, nine hundred ninety-three".