99313121331221 has 16 divisors (see below), whose sum is σ = 116768028843648. Its totient is φ = 82692865248000.

The previous prime is 99313121331211. The next prime is 99313121331239. The reversal of 99313121331221 is 12213312131399.

It is not a de Polignac number, because 99313121331221 - 2³⁸ = 99038243424277 is a prime.

It is a super-2 number, since 2×99313121331221² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99313121331211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 742505555 + ... + 742639296.

It is an arithmetic number, because the mean of its divisors is an integer number (7298001802728).

Almost surely, 2^{99313121331221} is an apocalyptic number.

It is an amenable number.

99313121331221 is a deficient number, since it is larger than the sum of its proper divisors (17454907512427).

99313121331221 is a wasteful number, since it uses less digits than its factorization.

99313121331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485145132.

The product of its digits is 52488, while the sum is 41.

The spelling of 99313121331221 in words is "ninety-nine trillion, three hundred thirteen billion, one hundred twenty-one million, three hundred thirty-one thousand, two hundred twenty-one".