9985129737821 has 8 divisors (see below), whose sum is σ = 12082846069440. Its totient is φ = 8055230712768.

The previous prime is 9985129737809. The next prime is 9985129737829. The reversal of 9985129737821 is 1287379215899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9985129737821 - 2⁶ = 9985129737757 is a prime.

It is a super-2 number, since 2×9985129737821² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9985129737829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41954326511 + ... + 41954326748.

It is an arithmetic number, because the mean of its divisors is an integer number (1510355758680).

Almost surely, 2^{9985129737821} is an apocalyptic number.

It is an amenable number.

9985129737821 is a deficient number, since it is larger than the sum of its proper divisors (2097716331619).

9985129737821 is a wasteful number, since it uses less digits than its factorization.

9985129737821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83908653283.

The product of its digits is 137168640, while the sum is 71.

The spelling of 9985129737821 in words is "nine trillion, nine hundred eighty-five billion, one hundred twenty-nine million, seven hundred thirty-seven thousand, eight hundred twenty-one".