9151851361221 has 32 divisors (see below), whose sum is σ = 13564908933120. Its totient is φ = 6098260303872.

The previous prime is 9151851361207. The next prime is 9151851361249. The reversal of 9151851361221 is 1221631581519.

9151851361221 is a `hidden beast` number, since 9 + 1 + 5 + 1 + 8 + 5 + 1 + 3 + 612 + 21 = 666.

9151851361221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9151851361221 - 2⁶ = 9151851361157 is a prime.

It is a super-2 number, since 2×9151851361221² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9151851361201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 768863356 + ... + 768875258.

It is an arithmetic number, because the mean of its divisors is an integer number (423903404160).

Almost surely, 2^{9151851361221} is an apocalyptic number.

It is an amenable number.

9151851361221 is a deficient number, since it is larger than the sum of its proper divisors (4413057571899).

9151851361221 is a wasteful number, since it uses less digits than its factorization.

9151851361221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23402 (or 23396 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The spelling of 9151851361221 in words is "nine trillion, one hundred fifty-one billion, eight hundred fifty-one million, three hundred sixty-one thousand, two hundred twenty-one".