21201111120220 has 24 divisors (see below), whose sum is σ = 44522445903264. Its totient is φ = 8480423009856.

The previous prime is 21201111120191. The next prime is 21201111120257. The reversal of 21201111120220 is 2202111110212.

It is a super-2 number, since 2×21201111120220² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21201111120194 and 21201111120203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8549782 + ... + 10747138.

It is an arithmetic number, because the mean of its divisors is an integer number (1855101912636).

Almost surely, 2^{21201111120220} is an apocalyptic number.

21201111120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201111120220 is an abundant number, since it is smaller than the sum of its proper divisors (23321334783044).

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

21201111120220 is a wasteful number, since it uses less digits than its factorization.

21201111120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679789 (or 2679787 counting only the distinct ones).

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

Adding to 21201111120220 its reverse (2202111110212), we get a palindrome (23403222230432).

The spelling of 21201111120220 in words is "twenty-one trillion, two hundred one billion, one hundred eleven million, one hundred twenty thousand, two hundred twenty".