121716971544 has 32 divisors (see below), whose sum is σ = 347762776320. Its totient is φ = 34776277536.

The previous prime is 121716971507. The next prime is 121716971557. The reversal of 121716971544 is 445179617121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121716971493 and 121716971502.

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, 362252724 + ... + 362253059.

It is an arithmetic number, because the mean of its divisors is an integer number (10867586760).

Almost surely, 2^121716971544 is an apocalyptic number.

121716971544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121716971544 is an abundant number, since it is smaller than the sum of its proper divisors (226045804776).

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

121716971544 is a wasteful number, since it uses less digits than its factorization.

121716971544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724505799 (or 724505795 counting only the distinct ones).

The product of its digits is 423360, while the sum is 48.

The spelling of 121716971544 in words is "one hundred twenty-one billion, seven hundred sixteen million, nine hundred seventy-one thousand, five hundred forty-four".