121556236444 has 6 divisors (see below), whose sum is σ = 212723413784. Its totient is φ = 60778118220.

The previous prime is 121556236429. The next prime is 121556236447. The reversal of 121556236444 is 444632655121.

It is a self number, because there is not a number n which added to its sum of digits gives 121556236444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121556236447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15194529552 + ... + 15194529559.

Almost surely, 2^121556236444 is an apocalyptic number.

It is an amenable number.

121556236444 is a deficient number, since it is larger than the sum of its proper divisors (91167177340).

121556236444 is a wasteful number, since it uses less digits than its factorization.

121556236444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30389059115 (or 30389059113 counting only the distinct ones).

The product of its digits is 691200, while the sum is 43.

The spelling of 121556236444 in words is "one hundred twenty-one billion, five hundred fifty-six million, two hundred thirty-six thousand, four hundred forty-four".