121310993 has 4 divisors (see below), whose sum is σ = 126585408. Its totient is φ = 116036580.

The previous prime is 121310989. The next prime is 121311007. The reversal of 121310993 is 399013121.

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 121310993 - 2² = 121310989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121310933) 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, 2637173 + ... + 2637218.

It is an arithmetic number, because the mean of its divisors is an integer number (31646352).

Almost surely, 2^121310993 is an apocalyptic number.

It is an amenable number.

121310993 is a deficient number, since it is larger than the sum of its proper divisors (5274415).

121310993 is an equidigital number, since it uses as much as digits as its factorization.

121310993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5274414.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 121310993 is about 11014.1269740275. The cubic root of 121310993 is about 495.0321279694.

The spelling of 121310993 in words is "one hundred twenty-one million, three hundred ten thousand, nine hundred ninety-three".