921222811 has 4 divisors (see below), whose sum is σ = 922379472. Its totient is φ = 920066152.

The previous prime is 921222773. The next prime is 921222851. The reversal of 921222811 is 118222129.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 921222811 - 2¹¹ = 921220763 is a prime.

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 921222811.

It is not an unprimeable number, because it can be changed into a prime (921222851) 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 3 ways as a sum of consecutive naturals, for example, 577135 + ... + 578728.

It is an arithmetic number, because the mean of its divisors is an integer number (230594868).

Almost surely, 2^921222811 is an apocalyptic number.

921222811 is a deficient number, since it is larger than the sum of its proper divisors (1156661).

921222811 is a wasteful number, since it uses less digits than its factorization.

921222811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156660.

The product of its digits is 1152, while the sum is 28.

The square root of 921222811 is about 30351.6525250274. The cubic root of 921222811 is about 973.0195384620.

It can be divided in two parts, 9212 and 22811, that added together give a palindrome (32023).

The spelling of 921222811 in words is "nine hundred twenty-one million, two hundred twenty-two thousand, eight hundred eleven".