9861513221 has 16 divisors (see below), whose sum is σ = 11940364800. Its totient is φ = 7950769920.

The previous prime is 9861513197. The next prime is 9861513253. The reversal of 9861513221 is 1223151689.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 9861513221 - 2¹⁴ = 9861496837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9861513421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183380 + ... + 230978.

It is an arithmetic number, because the mean of its divisors is an integer number (746272800).

Almost surely, 2^9861513221 is an apocalyptic number.

It is an amenable number.

9861513221 is a deficient number, since it is larger than the sum of its proper divisors (2078851579).

9861513221 is a wasteful number, since it uses less digits than its factorization.

9861513221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49364.

The product of its digits is 25920, while the sum is 38.

The square root of 9861513221 is about 99305.1520365384. The cubic root of 9861513221 is about 2144.4430661425.

The spelling of 9861513221 in words is "nine billion, eight hundred sixty-one million, five hundred thirteen thousand, two hundred twenty-one".