121684209616 has 20 divisors (see below), whose sum is σ = 235817328352. Its totient is φ = 60828124896.

The previous prime is 121684209587. The next prime is 121684209617. The reversal of 121684209616 is 616902486121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121684209617) 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, 801756 + ... + 941371.

Almost surely, 2^121684209616 is an apocalyptic number.

121684209616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121684209616 is a deficient number, since it is larger than the sum of its proper divisors (114133118736).

121684209616 is a wasteful number, since it uses less digits than its factorization.

121684209616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747498 (or 1747492 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 121684209616 in words is "one hundred twenty-one billion, six hundred eighty-four million, two hundred nine thousand, six hundred sixteen".