211211222120220 has 96 divisors (see below), whose sum is σ = 675878386917888. Its totient is φ = 48276673903872.

The previous prime is 211211222120219. The next prime is 211211222120263. The reversal of 211211222120220 is 22021222112112.

211211222120220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×211211222120220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139200774 + ... + 140709906.

It is an arithmetic number, because the mean of its divisors is an integer number (7040399863728).

Almost surely, 2^{211211222120220} is an apocalyptic number.

211211222120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211211222120220 is an abundant number, since it is smaller than the sum of its proper divisors (464667164797668).

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

211211222120220 is a wasteful number, since it uses less digits than its factorization.

211211222120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842379 (or 1842377 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 211211222120220 its reverse (22021222112112), we get a palindrome (233232444232332).

The spelling of 211211222120220 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twenty".