921011121 has 8 divisors (see below), whose sum is σ = 1364460960. Its totient is φ = 614007396.

The previous prime is 921011099. The next prime is 921011129. The reversal of 921011121 is 121110129.

It is a happy number.

It is not a de Polignac number, because 921011121 - 2¹⁵ = 920978353 is a prime.

It is a super-2 number, since 2×921011121² = 1696522970011353282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 921011094 and 921011103.

It is not an unprimeable number, because it can be changed into a prime (921011129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17055735 + ... + 17055788.

It is an arithmetic number, because the mean of its divisors is an integer number (170557620).

Almost surely, 2^921011121 is an apocalyptic number.

It is an amenable number.

921011121 is a deficient number, since it is larger than the sum of its proper divisors (443449839).

921011121 is a wasteful number, since it uses less digits than its factorization.

921011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34111532 (or 34111526 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The square root of 921011121 is about 30348.1650351385. The cubic root of 921011121 is about 972.9450019209.

The spelling of 921011121 in words is "nine hundred twenty-one million, eleven thousand, one hundred twenty-one".