121920940143 has 72 divisors (see below), whose sum is σ = 194466015744. Its totient is φ = 73485165600.

The previous prime is 121920940123. The next prime is 121920940151. The reversal of 121920940143 is 341049029121.

121920940143 is a `hidden beast` number, since 1 + 2 + 1 + 9 + 209 + 401 + 43 = 666.

It is not a de Polignac number, because 121920940143 - 2⁹ = 121920939631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121920940098 and 121920940107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121920940123) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6336808 + ... + 6356018.

Almost surely, 2^121920940143 is an apocalyptic number.

121920940143 is a deficient number, since it is larger than the sum of its proper divisors (72545075601).

121920940143 is a wasteful number, since it uses less digits than its factorization.

121920940143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19337 (or 19311 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

Adding to 121920940143 its reverse (341049029121), we get a palindrome (462969969264).

The spelling of 121920940143 in words is "one hundred twenty-one billion, nine hundred twenty million, nine hundred forty thousand, one hundred forty-three".