211122212021 has 8 divisors (see below), whose sum is σ = 241290414720. Its totient is φ = 180955981008.

The previous prime is 211122211987. The next prime is 211122212069. The reversal of 211122212021 is 120212221112.

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 211122212021 - 2¹⁸ = 211121949877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211122212221) 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, 255866 + ... + 698363.

It is an arithmetic number, because the mean of its divisors is an integer number (30161301840).

Almost surely, 2^211122212021 is an apocalyptic number.

It is an amenable number.

211122212021 is a deficient number, since it is larger than the sum of its proper divisors (30168202699).

211122212021 is an equidigital number, since it uses as much as digits as its factorization.

211122212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985843.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211122212021 its reverse (120212221112), we get a palindrome (331334433133).

Subtracting from 211122212021 its reverse (120212221112), we obtain a palindrome (90909990909).

The spelling of 211122212021 in words is "two hundred eleven billion, one hundred twenty-two million, two hundred twelve thousand, twenty-one".