121971823 has 4 divisors (see below), whose sum is σ = 123689808. Its totient is φ = 120253840.

The previous prime is 121971803. The next prime is 121971877. The reversal of 121971823 is 328179121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328179121 = 227 ⋅1445723.

It is a cyclic number.

It is not a de Polignac number, because 121971823 - 2⁵ = 121971791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121971803) 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, 858886 + ... + 859027.

It is an arithmetic number, because the mean of its divisors is an integer number (30922452).

Almost surely, 2^121971823 is an apocalyptic number.

121971823 is a deficient number, since it is larger than the sum of its proper divisors (1717985).

121971823 is an equidigital number, since it uses as much as digits as its factorization.

121971823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717984.

The product of its digits is 6048, while the sum is 34.

The square root of 121971823 is about 11044.0854306728. The cubic root of 121971823 is about 495.9293807172.

The spelling of 121971823 in words is "one hundred twenty-one million, nine hundred seventy-one thousand, eight hundred twenty-three".