121022717828 has 6 divisors (see below), whose sum is σ = 211789756206. Its totient is φ = 60511358912.

The previous prime is 121022717819. The next prime is 121022717861. The reversal of 121022717828 is 828717220121.

It can be written as a sum of positive squares in only one way, i.e., 120359037184 + 663680644 = 346928^2 + 25762^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15127839725 + ... + 15127839732.

It is an arithmetic number, because the mean of its divisors is an integer number (35298292701).

Almost surely, 2^121022717828 is an apocalyptic number.

It is an amenable number.

121022717828 is a deficient number, since it is larger than the sum of its proper divisors (90767038378).

121022717828 is a wasteful number, since it uses less digits than its factorization.

121022717828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30255679461 (or 30255679459 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 41.

Adding to 121022717828 its reverse (828717220121), we get a palindrome (949739937949).

The spelling of 121022717828 in words is "one hundred twenty-one billion, twenty-two million, seven hundred seventeen thousand, eight hundred twenty-eight".