921121129 has 16 divisors (see below), whose sum is σ = 958003200. Its totient is φ = 885040000.

The previous prime is 921121109. The next prime is 921121139.

921121129 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 921121129 - 2⁷ = 921121001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 921121097 and 921121106.

It is not an unprimeable number, because it can be changed into a prime (921121109) 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, 799704 + ... + 800854.

It is an arithmetic number, because the mean of its divisors is an integer number (59875200).

Almost surely, 2^921121129 is an apocalyptic number.

It is an amenable number.

921121129 is a deficient number, since it is larger than the sum of its proper divisors (36882071).

921121129 is a wasteful number, since it uses less digits than its factorization.

921121129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472.

The product of its digits is 648, while the sum is 28.

The square root of 921121129 is about 30349.9774135007. The cubic root of 921121129 is about 972.9837374187.

The spelling of 921121129 in words is "nine hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-nine".