211021123220 has 12 divisors (see below), whose sum is σ = 443144358804. Its totient is φ = 84408449280.

The previous prime is 211021123129. The next prime is 211021123223. The reversal of 211021123220 is 22321120112.

It can be written as a sum of positive squares in 2 ways, for example, as 47420288644 + 163600834576 = 217762^2 + 404476^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211021123223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5275528061 + ... + 5275528100.

It is an arithmetic number, because the mean of its divisors is an integer number (36928696567).

Almost surely, 2^211021123220 is an apocalyptic number.

211021123220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211021123220 is an abundant number, since it is smaller than the sum of its proper divisors (232123235584).

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

211021123220 is a wasteful number, since it uses less digits than its factorization.

211021123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551056170 (or 10551056168 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 211021123220 its reverse (22321120112), we get a palindrome (233342243332).

The spelling of 211021123220 in words is "two hundred eleven billion, twenty-one million, one hundred twenty-three thousand, two hundred twenty".