121672154693 has 4 divisors (see below), whose sum is σ = 121868717760. Its totient is φ = 121475591628.

The previous prime is 121672154683. The next prime is 121672154701. The reversal of 121672154693 is 396451276121.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 396451276121 = 53 ⋅7480212757.

It is a cyclic number.

It is not a de Polignac number, because 121672154693 - 2⁴ = 121672154677 is a prime.

It is a super-2 number, since 2×121672154693² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121672154633) 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, 98280605 + ... + 98281842.

It is an arithmetic number, because the mean of its divisors is an integer number (30467179440).

Almost surely, 2^121672154693 is an apocalyptic number.

It is an amenable number.

121672154693 is a deficient number, since it is larger than the sum of its proper divisors (196563067).

121672154693 is an equidigital number, since it uses as much as digits as its factorization.

121672154693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196563066.

The product of its digits is 544320, while the sum is 47.

The spelling of 121672154693 in words is "one hundred twenty-one billion, six hundred seventy-two million, one hundred fifty-four thousand, six hundred ninety-three".