121428078741 has 24 divisors (see below), whose sum is σ = 181495966080. Its totient is φ = 78138327456.

The previous prime is 121428078697. The next prime is 121428078749. The reversal of 121428078741 is 147870824121.

It is not a de Polignac number, because 121428078741 - 2⁹ = 121428078229 is a prime.

It is a super-2 number, since 2×121428078741² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121428078749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 876936 + ... + 1005918.

It is an arithmetic number, because the mean of its divisors is an integer number (7562331920).

Almost surely, 2^121428078741 is an apocalyptic number.

It is an amenable number.

121428078741 is a deficient number, since it is larger than the sum of its proper divisors (60067887339).

121428078741 is a wasteful number, since it uses less digits than its factorization.

121428078741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132625 (or 132622 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The spelling of 121428078741 in words is "one hundred twenty-one billion, four hundred twenty-eight million, seventy-eight thousand, seven hundred forty-one".