211212021021220 has 72 divisors (see below), whose sum is σ = 471209554811520. Its totient is φ = 79508590302720.

The previous prime is 211212021021163. The next prime is 211212021021241. The reversal of 211212021021220 is 22120120212112.

It is a super-2 number, since 2×211212021021220² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69248575 + ... + 72234265.

It is an arithmetic number, because the mean of its divisors is an integer number (6544577150160).

Almost surely, 2^{211212021021220} is an apocalyptic number.

211212021021220 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 211212021021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235604777405760).

211212021021220 is an abundant number, since it is smaller than the sum of its proper divisors (259997533790300).

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

211212021021220 is a wasteful number, since it uses less digits than its factorization.

211212021021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997973 (or 2997954 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211212021021220 its reverse (22120120212112), we get a palindrome (233332141233332).

The spelling of 211212021021220 in words is "two hundred eleven trillion, two hundred twelve billion, twenty-one million, twenty-one thousand, two hundred twenty".