121234280128 has 56 divisors (see below), whose sum is σ = 260308232240. Its totient is φ = 55689016320.

The previous prime is 121234280087. The next prime is 121234280159. The reversal of 121234280128 is 821082432121.

121234280128 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 121234280093 and 121234280102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169743 + ... + 520846.

It is an arithmetic number, because the mean of its divisors is an integer number (4648361290).

Almost surely, 2^121234280128 is an apocalyptic number.

It is an amenable number.

121234280128 is an abundant number, since it is smaller than the sum of its proper divisors (139073952112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121234280128 is a wasteful number, since it uses less digits than its factorization.

121234280128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690825 (or 690815 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The spelling of 121234280128 in words is "one hundred twenty-one billion, two hundred thirty-four million, two hundred eighty thousand, one hundred twenty-eight".