9921303131 has 4 divisors (see below), whose sum is σ = 10443477000. Its totient is φ = 9399129264.

The previous prime is 9921303121. The next prime is 9921303137. The reversal of 9921303131 is 1313031299.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1313031299 = 10831 ⋅121229.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9921303131 is a prime.

It is a super-2 number, since 2×9921303131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9921303137) 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, 261086906 + ... + 261086943.

It is an arithmetic number, because the mean of its divisors is an integer number (2610869250).

Almost surely, 2^9921303131 is an apocalyptic number.

9921303131 is a deficient number, since it is larger than the sum of its proper divisors (522173869).

9921303131 is a wasteful number, since it uses less digits than its factorization.

9921303131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522173868.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 9921303131 is about 99605.7384441278. The cubic root of 9921303131 is about 2148.7682240104.

The spelling of 9921303131 in words is "nine billion, nine hundred twenty-one million, three hundred three thousand, one hundred thirty-one".