211222221220 has 24 divisors (see below), whose sum is σ = 443609788608. Its totient is φ = 84480674400.

The previous prime is 211222221193. The next prime is 211222221233. The reversal of 211222221220 is 22122222112.

It is a super-2 number, since 2×211222221220² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300366 + ... + 716005.

It is an arithmetic number, because the mean of its divisors is an integer number (18483741192).

Almost surely, 2^211222221220 is an apocalyptic number.

211222221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211222221220 is an abundant number, since it is smaller than the sum of its proper divisors (232387567388).

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

211222221220 is a wasteful number, since it uses less digits than its factorization.

211222221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026771 (or 1026769 counting only the distinct ones).

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

Adding to 211222221220 its reverse (22122222112), we get a palindrome (233344443332).

The spelling of 211222221220 in words is "two hundred eleven billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty".