211221212022 has 48 divisors (see below), whose sum is σ = 471346780320. Its totient is φ = 68310038016.

The previous prime is 211221212021. The next prime is 211221212051. The reversal of 211221212022 is 220212122112.

It is a happy number.

211221212022 is a `hidden beast` number, since 211 + 221 + 212 + 0 + 22 = 666.

It is a super-2 number, since 2×211221212022² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 211221211986 and 211221212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221212021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214122 + ... + 684317.

It is an arithmetic number, because the mean of its divisors is an integer number (9819724590).

Almost surely, 2^211221212022 is an apocalyptic number.

211221212022 is an abundant number, since it is smaller than the sum of its proper divisors (260125568298).

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

211221212022 is a wasteful number, since it uses less digits than its factorization.

211221212022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898837 (or 898834 counting only the distinct ones).

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

Adding to 211221212022 its reverse (220212122112), we get a palindrome (431433334134).

The spelling of 211221212022 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, twenty-two".