211021213220 has 24 divisors (see below), whose sum is σ = 443211236664. Its totient is φ = 84395782656.

The previous prime is 211021213201. The next prime is 211021213237. The reversal of 211021213220 is 22312120112.

It can be written as a sum of positive squares in 4 ways, for example, as 12509975104 + 198511238116 = 111848^2 + 445546^2 .

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, 657119 + ... + 924038.

It is an arithmetic number, because the mean of its divisors is an integer number (18467134861).

Almost surely, 2^211021213220 is an apocalyptic number.

211021213220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211021213220 is an abundant number, since it is smaller than the sum of its proper divisors (232190023444).

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

211021213220 is a wasteful number, since it uses less digits than its factorization.

211021213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587839 (or 1587837 counting only the distinct ones).

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

Adding to 211021213220 its reverse (22312120112), we get a palindrome (233333333332).

The spelling of 211021213220 in words is "two hundred eleven billion, twenty-one million, two hundred thirteen thousand, two hundred twenty".