213221102203220 has 72 divisors (see below), whose sum is σ = 475852886441016. Its totient is φ = 80237698523136.

The previous prime is 213221102203217. The next prime is 213221102203229. The reversal of 213221102203220 is 22302201122312.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 47202776644 + 213173899426576 = 217262^2 + 14600476^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213221102203229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5979392 + ... + 21498728.

Almost surely, 2^{213221102203220} is an apocalyptic number.

213221102203220 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 213221102203220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237926443220508).

213221102203220 is an abundant number, since it is smaller than the sum of its proper divisors (262631784237796).

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

213221102203220 is a wasteful number, since it uses less digits than its factorization.

213221102203220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15521757 (or 15521738 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 213221102203220 its reverse (22302201122312), we get a palindrome (235523303325532).

The spelling of 213221102203220 in words is "two hundred thirteen trillion, two hundred twenty-one billion, one hundred two million, two hundred three thousand, two hundred twenty".