9993211881 has 16 divisors (see below), whose sum is σ = 14134180608. Its totient is φ = 6258643200.

The previous prime is 9993211853. The next prime is 9993211883. The reversal of 9993211881 is 1881123999.

It is not a de Polignac number, because 9993211881 - 2⁹ = 9993211369 is a prime.

It is a super-2 number, since 2×9993211881² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9993211883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153505 + ... + 208686.

It is an arithmetic number, because the mean of its divisors is an integer number (883386288).

Almost surely, 2^9993211881 is an apocalyptic number.

It is an amenable number.

9993211881 is a deficient number, since it is larger than the sum of its proper divisors (4140968727).

9993211881 is a wasteful number, since it uses less digits than its factorization.

9993211881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362752.

The product of its digits is 279936, while the sum is 51.

The square root of 9993211881 is about 99966.0536432243. The cubic root of 9993211881 is about 2153.9470943849.

The spelling of 9993211881 in words is "nine billion, nine hundred ninety-three million, two hundred eleven thousand, eight hundred eighty-one".