921222211 has 12 divisors (see below), whose sum is σ = 1140043152. Its totient is φ = 728878176.

The previous prime is 921222131. The next prime is 921222221. The reversal of 921222211 is 112222129.

It is a de Polignac number, because none of the positive numbers 2^k-921222211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921222221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 388176 + ... + 390541.

It is an arithmetic number, because the mean of its divisors is an integer number (95003596).

Almost surely, 2^921222211 is an apocalyptic number.

921222211 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

921222211 is a deficient number, since it is larger than the sum of its proper divisors (218820941).

921222211 is a wasteful number, since it uses less digits than its factorization.

921222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778750 (or 778737 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 921222211 is about 30351.6426408852. The cubic root of 921222211 is about 973.0193272167.

The spelling of 921222211 in words is "nine hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".