211212212122220 has 24 divisors (see below), whose sum is σ = 443546416467504. Its totient is φ = 84484737989696.

The previous prime is 211212212122213. The next prime is 211212212122291. The reversal of 211212212122220 is 22221212212112.

It is a super-2 number, since 2×211212212122220² (a number of 29 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, 3009227 + ... + 20772093.

It is an arithmetic number, because the mean of its divisors is an integer number (18481100686146).

Almost surely, 2^{211212212122220} is an apocalyptic number.

211212212122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211212212122220 is an abundant number, since it is smaller than the sum of its proper divisors (232334204345284).

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

211212212122220 is a wasteful number, since it uses less digits than its factorization.

211212212122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18357409 (or 18357407 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 211212212122220 its reverse (22221212212112), we get a palindrome (233433424334332).

The spelling of 211212212122220 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty".