211222212021 has 12 divisors (see below), whose sum is σ = 313344663372. Its totient is φ = 137009002176.

The previous prime is 211222212011. The next prime is 211222212023. The reversal of 211222212021 is 120212222112.

It is a happy number.

211222212021 is a `hidden beast` number, since 211 + 222 + 212 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 204787926225 + 6434285796 = 452535^2 + 80214^2 .

It is not a de Polignac number, because 211222212021 - 2⁵ = 211222211989 is a prime.

It is a super-2 number, since 2×211222212021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211222211985 and 211222212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222212023) 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, 317150136 + ... + 317150801.

It is an arithmetic number, because the mean of its divisors is an integer number (26112055281).

Almost surely, 2^211222212021 is an apocalyptic number.

It is an amenable number.

211222212021 is a deficient number, since it is larger than the sum of its proper divisors (102122451351).

211222212021 is a wasteful number, since it uses less digits than its factorization.

211222212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634300980 (or 634300977 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211222212021 its reverse (120212222112), we get a palindrome (331434434133).

The spelling of 211222212021 in words is "two hundred eleven billion, two hundred twenty-two million, two hundred twelve thousand, twenty-one".