121840028 has 24 divisors (see below), whose sum is σ = 219152304. Its totient is φ = 59235200.

The previous prime is 121840009. The next prime is 121840063. The reversal of 121840028 is 820048121.

It is a junction number, because it is equal to n+sod(n) for n = 121839979 and 121840006.

It is a congruent number.

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, 55838 + ... + 57978.

It is an arithmetic number, because the mean of its divisors is an integer number (9131346).

Almost surely, 2^121840028 is an apocalyptic number.

It is an amenable number.

121840028 is a deficient number, since it is larger than the sum of its proper divisors (97312276).

121840028 is a wasteful number, since it uses less digits than its factorization.

121840028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2533 (or 2531 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 121840028 is about 11038.1170495696. The cubic root of 121840028 is about 495.7506930856.

Adding to 121840028 its reverse (820048121), we get a palindrome (941888149).

The spelling of 121840028 in words is "one hundred twenty-one million, eight hundred forty thousand, twenty-eight".