121556622673984 has 63 divisors (see below), whose sum is σ = 245860456108813. Its totient is φ = 59629257489152.

The previous prime is 121556622673961. The next prime is 121556622673999. The reversal of 121556622673984 is 489376226655121.

It is a happy number.

The square root of 121556622673984 is 11025272.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 87629818766400 + 33926803907584 = 9361080^2 + 5824672^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4674702327 + ... + 4674728329.

Almost surely, 2^{121556622673984} is an apocalyptic number.

121556622673984 is the 11025272-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121556622673984

121556622673984 is an abundant number, since it is smaller than the sum of its proper divisors (124303833434829).

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

121556622673984 is an frugal number, since it uses more digits than its factorization.

121556622673984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52124 (or 26058 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 67.

The spelling of 121556622673984 in words is "one hundred twenty-one trillion, five hundred fifty-six billion, six hundred twenty-two million, six hundred seventy-three thousand, nine hundred eighty-four".