211221092 has 12 divisors (see below), whose sum is σ = 369894000. Its totient is φ = 105537096.

The previous prime is 211221091. The next prime is 211221169. The reversal of 211221092 is 290122112.

It is a happy number.

It is a super-2 number, since 2×211221092² = 89228699411344928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11618 + ... + 23609.

It is an arithmetic number, because the mean of its divisors is an integer number (30824500).

Almost surely, 2^211221092 is an apocalyptic number.

It is an amenable number.

211221092 is a deficient number, since it is larger than the sum of its proper divisors (158672908).

211221092 is a wasteful number, since it uses less digits than its factorization.

211221092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36730 (or 36728 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 211221092 is about 14533.4473542928. The cubic root of 211221092 is about 595.5420449451.

The spelling of 211221092 in words is "two hundred eleven million, two hundred twenty-one thousand, ninety-two".