211221222210220 has 96 divisors (see below), whose sum is σ = 453312785959488. Its totient is φ = 82651636150272.

The previous prime is 211221222210169. The next prime is 211221222210263. The reversal of 211221222210220 is 22012222122112.

It is a super-2 number, since 2×211221222210220² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221222210191 and 211221222210200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232169262 + ... + 233077258.

It is an arithmetic number, because the mean of its divisors is an integer number (4722008187078).

Almost surely, 2^{211221222210220} is an apocalyptic number.

211221222210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221222210220 is an abundant number, since it is smaller than the sum of its proper divisors (242091563749268).

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

211221222210220 is a wasteful number, since it uses less digits than its factorization.

211221222210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909379 (or 909377 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 211221222210220 its reverse (22012222122112), we get a palindrome (233233444332332).

The spelling of 211221222210220 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred ten thousand, two hundred twenty".