121398730428 has 96 divisors (see below), whose sum is σ = 288046015488. Its totient is φ = 39789792000.

The previous prime is 121398730421. The next prime is 121398730463. The reversal of 121398730428 is 824037893121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121398730421) 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, 160367826 + ... + 160368582.

It is an arithmetic number, because the mean of its divisors is an integer number (3000479328).

Almost surely, 2^121398730428 is an apocalyptic number.

It is an amenable number.

121398730428 is an abundant number, since it is smaller than the sum of its proper divisors (166647285060).

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

121398730428 is a wasteful number, since it uses less digits than its factorization.

121398730428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603 (or 1601 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 121398730428 in words is "one hundred twenty-one billion, three hundred ninety-eight million, seven hundred thirty thousand, four hundred twenty-eight".