21211110120220 has 48 divisors (see below), whose sum is σ = 46765151354880. Its totient is φ = 8065766465856.

The previous prime is 21211110120209. The next prime is 21211110120223. The reversal of 21211110120220 is 2202101111212.

It is a super-2 number, since 2×21211110120220² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211110120194 and 21211110120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211110120223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141370140 + ... + 141520099.

It is an arithmetic number, because the mean of its divisors is an integer number (974273986560).

Almost surely, 2^{21211110120220} is an apocalyptic number.

21211110120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211110120220 is an abundant number, since it is smaller than the sum of its proper divisors (25554041234660).

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

21211110120220 is a wasteful number, since it uses less digits than its factorization.

21211110120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282890434 (or 282890432 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21211110120220 its reverse (2202101111212), we get a palindrome (23413211231432).

The spelling of 21211110120220 in words is "twenty-one trillion, two hundred eleven billion, one hundred ten million, one hundred twenty thousand, two hundred twenty".