211021021200220 has 144 divisors (see below), whose sum is σ = 556951663457280. Its totient is φ = 65740326791040.

The previous prime is 211021021200181. The next prime is 211021021200259. The reversal of 211021021200220 is 22002120120112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (211021021200181) and next prime (211021021200259).

It is a junction number, because it is equal to n+sod(n) for n = 211021021200194 and 211021021200203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31264621 + ... + 37410139.

It is an arithmetic number, because the mean of its divisors is an integer number (3867719885120).

Almost surely, 2^{211021021200220} is an apocalyptic number.

211021021200220 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 211021021200220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278475831728640).

211021021200220 is an abundant number, since it is smaller than the sum of its proper divisors (345930642257060).

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

211021021200220 is a wasteful number, since it uses less digits than its factorization.

211021021200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6147584 (or 6147571 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211021021200220 its reverse (22002120120112), we get a palindrome (233023141320332).

The spelling of 211021021200220 in words is "two hundred eleven trillion, twenty-one billion, twenty-one million, two hundred thousand, two hundred twenty".