921321123121 has 16 divisors (see below), whose sum is σ = 1054298033280. Its totient is φ = 788684682240.

The previous prime is 921321123067. The next prime is 921321123241. The reversal of 921321123121 is 121321123129.

It is not a de Polignac number, because 921321123121 - 2²³ = 921312734513 is a prime.

It is a super-2 number, since 2×921321123121² (a number of 25 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 921321123121.

It is not an unprimeable number, because it can be changed into a prime (921321120121) 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 15 ways as a sum of consecutive naturals, for example, 21179025 + ... + 21222481.

It is an arithmetic number, because the mean of its divisors is an integer number (65893627080).

Almost surely, 2^921321123121 is an apocalyptic number.

It is an amenable number.

921321123121 is a deficient number, since it is larger than the sum of its proper divisors (132976910159).

921321123121 is a wasteful number, since it uses less digits than its factorization.

921321123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47304.

The product of its digits is 1296, while the sum is 28.

The spelling of 921321123121 in words is "nine hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred twenty-one".