121118151816123 has 128 divisors (see below), whose sum is σ = 210702012825600. Its totient is φ = 60008601945600.

The previous prime is 121118151816121. The next prime is 121118151816127. The reversal of 121118151816123 is 321618151811121.

It is not a de Polignac number, because 121118151816123 - 2¹ = 121118151816121 is a prime.

It is a super-2 number, since 2×121118151816123² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121118151816121) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 14314870113 + ... + 14314878573.

It is an arithmetic number, because the mean of its divisors is an integer number (1646109475200).

Almost surely, 2^{121118151816123} is an apocalyptic number.

121118151816123 is a deficient number, since it is larger than the sum of its proper divisors (89583861009477).

121118151816123 is a wasteful number, since it uses less digits than its factorization.

121118151816123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15993.

The product of its digits is 23040, while the sum is 42.

The spelling of 121118151816123 in words is "one hundred twenty-one trillion, one hundred eighteen billion, one hundred fifty-one million, eight hundred sixteen thousand, one hundred twenty-three".