121999435168623 has 32 divisors (see below), whose sum is σ = 174047750800896. Its totient is φ = 75845537906688.

The previous prime is 121999435168613. The next prime is 121999435168627. The reversal of 121999435168623 is 326861534999121.

It is not a de Polignac number, because 121999435168623 - 2⁹ = 121999435168111 is a prime.

It is a super-2 number, since 2×121999435168623² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121999435168627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135580786 + ... + 136477647.

It is an arithmetic number, because the mean of its divisors is an integer number (5438992212528).

Almost surely, 2^{121999435168623} is an apocalyptic number.

121999435168623 is a deficient number, since it is larger than the sum of its proper divisors (52048315632273).

121999435168623 is a wasteful number, since it uses less digits than its factorization.

121999435168623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272058623.

The product of its digits is 151165440, while the sum is 69.

The spelling of 121999435168623 in words is "one hundred twenty-one trillion, nine hundred ninety-nine billion, four hundred thirty-five million, one hundred sixty-eight thousand, six hundred twenty-three".