121720549996 has 12 divisors (see below), whose sum is σ = 213064203352. Its totient is φ = 60845063328.

The previous prime is 121720549921. The next prime is 121720549997. The reversal of 121720549996 is 699945027121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121720549997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3784905 + ... + 3816928.

Almost surely, 2^121720549996 is an apocalyptic number.

It is an amenable number.

121720549996 is a deficient number, since it is larger than the sum of its proper divisors (91343653356).

121720549996 is a wasteful number, since it uses less digits than its factorization.

121720549996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7605840 (or 7605838 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 121720549996 in words is "one hundred twenty-one billion, seven hundred twenty million, five hundred forty-nine thousand, nine hundred ninety-six".