211010111220 has 48 divisors (see below), whose sum is σ = 596248773120. Its totient is φ = 55753128576.

The previous prime is 211010111219. The next prime is 211010111261. The reversal of 211010111220 is 22111010112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 211010111196 and 211010111205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16125732 + ... + 16138811.

It is an arithmetic number, because the mean of its divisors is an integer number (12421849440).

Almost surely, 2^211010111220 is an apocalyptic number.

211010111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211010111220 is an abundant number, since it is smaller than the sum of its proper divisors (385238661900).

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

211010111220 is a wasteful number, since it uses less digits than its factorization.

211010111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32264664 (or 32264662 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 211010111220 its reverse (22111010112), we get a palindrome (233121121332).

The spelling of 211010111220 in words is "two hundred eleven billion, ten million, one hundred eleven thousand, two hundred twenty".