21211120010220 has 288 divisors, whose sum is σ = 74689494458880. Its totient is φ = 4393384427520.

The previous prime is 21211120010177. The next prime is 21211120010279. The reversal of 21211120010220 is 2201002111212.

It is a super-2 number, since 2×21211120010220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21211120010220.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1709100 + ... + 6733740.

Almost surely, 2^{21211120010220} is an apocalyptic number.

21211120010220 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 21211120010220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37344747229440).

21211120010220 is an abundant number, since it is smaller than the sum of its proper divisors (53478374448660).

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

21211120010220 is a wasteful number, since it uses less digits than its factorization.

21211120010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024725 (or 5024700 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211120010220 its reverse (2201002111212), we get a palindrome (23412122121432).

The spelling of 21211120010220 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty million, ten thousand, two hundred twenty".