211222021 has 8 divisors (see below), whose sum is σ = 212747040. Its totient is φ = 209701968.

The previous prime is 211222019. The next prime is 211222057. The reversal of 211222021 is 120222112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211222021 - 2¹ = 211222019 is a prime.

It is a super-2 number, since 2×211222021² = 89229484310648882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211221992 and 211222010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222061) 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, 129010 + ... + 130636.

It is an arithmetic number, because the mean of its divisors is an integer number (26593380).

Almost surely, 2^211222021 is an apocalyptic number.

It is an amenable number.

211222021 is a deficient number, since it is larger than the sum of its proper divisors (1525019).

211222021 is a wasteful number, since it uses less digits than its factorization.

211222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2483.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 211222021 is about 14533.4793150161. The cubic root of 211222021 is about 595.5429180551.

Adding to 211222021 its reverse (120222112), we get a palindrome (331444133).

Subtracting from 211222021 its reverse (120222112), we obtain a palindrome (90999909).

The spelling of 211222021 in words is "two hundred eleven million, two hundred twenty-two thousand, twenty-one".