121020001228 has 48 divisors (see below), whose sum is σ = 251987009344. Its totient is φ = 49772620800.

The previous prime is 121020001129. The next prime is 121020001229. The reversal of 121020001228 is 822100020121.

It is not an unprimeable number, because it can be changed into a prime (121020001229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 724473 + ... + 875728.

Almost surely, 2^121020001228 is an apocalyptic number.

It is an amenable number.

121020001228 is an abundant number, since it is smaller than the sum of its proper divisors (130967008116).

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

121020001228 is a wasteful number, since it uses less digits than its factorization.

121020001228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600322 (or 1600320 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121020001228 its reverse (822100020121), we get a palindrome (943120021349).

The spelling of 121020001228 in words is "one hundred twenty-one billion, twenty million, one thousand, two hundred twenty-eight".