121406516646 has 16 divisors (see below), whose sum is σ = 253370121984. Its totient is φ = 38709324104.

The previous prime is 121406516579. The next prime is 121406516723. The reversal of 121406516646 is 646615604121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121406516598 and 121406516607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439878546 + ... + 439878821.

It is an arithmetic number, because the mean of its divisors is an integer number (15835632624).

Almost surely, 2^121406516646 is an apocalyptic number.

121406516646 is an abundant number, since it is smaller than the sum of its proper divisors (131963605338).

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

121406516646 is a wasteful number, since it uses less digits than its factorization.

121406516646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879757395.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 121406516646 in words is "one hundred twenty-one billion, four hundred six million, five hundred sixteen thousand, six hundred forty-six".