211221222220 has 48 divisors (see below), whose sum is σ = 445505669280. Its totient is φ = 84119076864.

The previous prime is 211221222211. The next prime is 211221222229. The reversal of 211221222220 is 22222122112.

It is an interprime number because it is at equal distance from previous prime (211221222211) and next prime (211221222229).

It is a super-2 number, since 2×211221222220² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221222229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12054826 + ... + 12072334.

It is an arithmetic number, because the mean of its divisors is an integer number (9281368110).

Almost surely, 2^211221222220 is an apocalyptic number.

211221222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221222220 is an abundant number, since it is smaller than the sum of its proper divisors (234284447060).

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

211221222220 is a wasteful number, since it uses less digits than its factorization.

211221222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20122 (or 20120 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 211221222220 its reverse (22222122112), we get a palindrome (233443344332).

The spelling of 211221222220 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty".