9991971121419 has 16 divisors (see below), whose sum is σ = 16917623063040. Its totient is φ = 5709697783560.

The previous prime is 9991971121393. The next prime is 9991971121501. The reversal of 9991971121419 is 9141211791999.

9991971121419 is a `hidden beast` number, since 9 + 9 + 9 + 1 + 97 + 1 + 121 + 419 = 666.

It is not a de Polignac number, because 9991971121419 - 2¹³ = 9991971113227 is a prime.

It is a super-2 number, since 2×9991971121419² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (9991971123419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26433785847 + ... + 26433786224.

It is an arithmetic number, because the mean of its divisors is an integer number (1057351441440).

Almost surely, 2^{9991971121419} is an apocalyptic number.

9991971121419 is a deficient number, since it is larger than the sum of its proper divisors (6925651941621).

9991971121419 is a wasteful number, since it uses less digits than its factorization.

9991971121419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52867572087 (or 52867572081 counting only the distinct ones).

The product of its digits is 3306744, while the sum is 63.

The spelling of 9991971121419 in words is "nine trillion, nine hundred ninety-one billion, nine hundred seventy-one million, one hundred twenty-one thousand, four hundred nineteen".