121307856823 has 4 divisors (see below), whose sum is σ = 121811209168. Its totient is φ = 120804504480.

The previous prime is 121307856821. The next prime is 121307856827. The reversal of 121307856823 is 328658703121.

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

It is a cyclic number.

It is not a de Polignac number, because 121307856823 - 2¹ = 121307856821 is a prime.

It is a super-2 number, since 2×121307856823² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121307856821) 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, 251675811 + ... + 251676292.

It is an arithmetic number, because the mean of its divisors is an integer number (30452802292).

Almost surely, 2^121307856823 is an apocalyptic number.

121307856823 is a deficient number, since it is larger than the sum of its proper divisors (503352345).

121307856823 is an equidigital number, since it uses as much as digits as its factorization.

121307856823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503352344.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 121307856823 in words is "one hundred twenty-one billion, three hundred seven million, eight hundred fifty-six thousand, eight hundred twenty-three".