9851499221 has 4 divisors (see below), whose sum is σ = 10369999200. Its totient is φ = 9332999244.

The previous prime is 9851499209. The next prime is 9851499223. The reversal of 9851499221 is 1229941589.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1229941589 = 199 ⋅6180611.

It is a cyclic number.

It is not a de Polignac number, because 9851499221 - 2¹⁰ = 9851498197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9851499221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9851499223) 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, 259249961 + ... + 259249998.

It is an arithmetic number, because the mean of its divisors is an integer number (2592499800).

Almost surely, 2^9851499221 is an apocalyptic number.

It is an amenable number.

9851499221 is a deficient number, since it is larger than the sum of its proper divisors (518499979).

9851499221 is a wasteful number, since it uses less digits than its factorization.

9851499221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518499978.

The product of its digits is 466560, while the sum is 50.

The square root of 9851499221 is about 99254.7188853004. The cubic root of 9851499221 is about 2143.7169529074.

The spelling of 9851499221 in words is "nine billion, eight hundred fifty-one million, four hundred ninety-nine thousand, two hundred twenty-one".