211212322220 has 12 divisors (see below), whose sum is σ = 443545876704. Its totient is φ = 84484928880.

The previous prime is 211212322219. The next prime is 211212322241. The reversal of 211212322220 is 22223212112.

It is a super-2 number, since 2×211212322220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10560616111 = 211212322220 / (2 + 1 + 1 + 2 + 1 + 2 + 3 + 2 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 211212322192 and 211212322201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5280308036 + ... + 5280308075.

It is an arithmetic number, because the mean of its divisors is an integer number (36962156392).

Almost surely, 2^211212322220 is an apocalyptic number.

211212322220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211212322220 is an abundant number, since it is smaller than the sum of its proper divisors (232333554484).

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

211212322220 is a wasteful number, since it uses less digits than its factorization.

211212322220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560616120 (or 10560616118 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 211212322220 its reverse (22223212112), we get a palindrome (233435534332).

The spelling of 211212322220 in words is "two hundred eleven billion, two hundred twelve million, three hundred twenty-two thousand, two hundred twenty".