211211111122220 has 24 divisors (see below), whose sum is σ = 483865454571408. Its totient is φ = 76804040408000.

The previous prime is 211211111122201. The next prime is 211211111122241. The reversal of 211211111122220 is 22221111112112.

It is a happy number.

It is a super-2 number, since 2×211211111122220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 211211111122192 and 211211111122201.

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, 480025252331 + ... + 480025252770.

It is an arithmetic number, because the mean of its divisors is an integer number (20161060607142).

Almost surely, 2^{211211111122220} is an apocalyptic number.

211211111122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211211111122220 is an abundant number, since it is smaller than the sum of its proper divisors (272654343449188).

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

211211111122220 is a wasteful number, since it uses less digits than its factorization.

211211111122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960050505121 (or 960050505119 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211211111122220 its reverse (22221111112112), we get a palindrome (233432222234332).

The spelling of 211211111122220 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred eleven million, one hundred twenty-two thousand, two hundred twenty".