121312231993 has 8 divisors (see below), whose sum is σ = 124284189312. Its totient is φ = 118356560016.

The previous prime is 121312231979. The next prime is 121312232029. The reversal of 121312231993 is 399132213121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121312231993 is a prime.

It is a super-2 number, since 2×121312231993² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121312231913) 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 7 ways as a sum of consecutive naturals, for example, 4056255 + ... + 4086052.

It is an arithmetic number, because the mean of its divisors is an integer number (15535523664).

Almost surely, 2^121312231993 is an apocalyptic number.

It is an amenable number.

121312231993 is a deficient number, since it is larger than the sum of its proper divisors (2971957319).

121312231993 is an equidigital number, since it uses as much as digits as its factorization.

121312231993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8142671.

The product of its digits is 17496, while the sum is 37.

The spelling of 121312231993 in words is "one hundred twenty-one billion, three hundred twelve million, two hundred thirty-one thousand, nine hundred ninety-three".