211220922 has 16 divisors (see below), whose sum is σ = 460845792. Its totient is φ = 64006320.

The previous prime is 211220921. The next prime is 211220927. The reversal of 211220922 is 229022112.

It is a happy number.

It is a super-2 number, since 2×211220922² = 89228555781060168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211220921) 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 7 ways as a sum of consecutive naturals, for example, 1600093 + ... + 1600224.

It is an arithmetic number, because the mean of its divisors is an integer number (28802862).

Almost surely, 2^211220922 is an apocalyptic number.

211220922 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

211220922 is an abundant number, since it is smaller than the sum of its proper divisors (249624870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211220922 is a wasteful number, since it uses less digits than its factorization.

211220922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200333.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 211220922 is about 14533.4415057136. The cubic root of 211220922 is about 595.5418851722.

The spelling of 211220922 in words is "two hundred eleven million, two hundred twenty thousand, nine hundred twenty-two".