10001031221999 has 4 divisors (see below), whose sum is σ = 10001765579640. Its totient is φ = 10000296864360.

The previous prime is 10001031221969. The next prime is 10001031222011. The reversal of 10001031221999 is 99912213010001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10001031221999 is a prime.

It is a super-2 number, since 2×10001031221999² (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 (10001031221969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367158392 + ... + 367185629.

It is an arithmetic number, because the mean of its divisors is an integer number (2500441394910).

Almost surely, 2^{10001031221999} is an apocalyptic number.

10001031221999 is a deficient number, since it is larger than the sum of its proper divisors (734357641).

10001031221999 is an equidigital number, since it uses as much as digits as its factorization.

10001031221999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734357640.

The product of its (nonzero) digits is 8748, while the sum is 38.

The spelling of 10001031221999 in words is "ten trillion, one billion, thirty-one million, two hundred twenty-one thousand, nine hundred ninety-nine".