211011020220 has 384 divisors, whose sum is σ = 794354319360. Its totient is φ = 40419025920.

The previous prime is 211011020219. The next prime is 211011020261. The reversal of 211011020220 is 22020110112.

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 = 211011020196 and 211011020205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 55193229 + ... + 55197051.

It is an arithmetic number, because the mean of its divisors is an integer number (2068631040).

Almost surely, 2^211011020220 is an apocalyptic number.

211011020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211011020220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (397177159680).

211011020220 is an abundant number, since it is smaller than the sum of its proper divisors (583343299140).

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

211011020220 is a wasteful number, since it uses less digits than its factorization.

211011020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4785 (or 4783 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 211011020220 its reverse (22020110112), we get a palindrome (233031130332).

The spelling of 211011020220 in words is "two hundred eleven billion, eleven million, twenty thousand, two hundred twenty".