9902121323 has 4 divisors (see below), whose sum is σ = 9918170760. Its totient is φ = 9886071888.

The previous prime is 9902121269. The next prime is 9902121329. The reversal of 9902121323 is 3231212099.

9902121323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3231212099 = 101 ⋅31992199.

It is a cyclic number.

It is not a de Polignac number, because 9902121323 - 2⁶ = 9902121259 is a prime.

It is a super-2 number, since 2×9902121323² (a number of 21 digits) contains 22 as substring.

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 9902121323.

It is not an unprimeable number, because it can be changed into a prime (9902121329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8023793 + ... + 8025026.

It is an arithmetic number, because the mean of its divisors is an integer number (2479542690).

Almost surely, 2^9902121323 is an apocalyptic number.

9902121323 is a deficient number, since it is larger than the sum of its proper divisors (16049437).

9902121323 is a wasteful number, since it uses less digits than its factorization.

9902121323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16049436.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 9902121323 is about 99509.4031888444. The cubic root of 9902121323 is about 2147.3825239456.

The spelling of 9902121323 in words is "nine billion, nine hundred two million, one hundred twenty-one thousand, three hundred twenty-three".