21011201100220 has 12 divisors (see below), whose sum is σ = 44123522310504. Its totient is φ = 8404480440080.

The previous prime is 21011201100209. The next prime is 21011201100223. The reversal of 21011201100220 is 2200110211012.

It is a super-2 number, since 2×21011201100220² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21011201100220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011201100223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525280027486 + ... + 525280027525.

It is an arithmetic number, because the mean of its divisors is an integer number (3676960192542).

Almost surely, 2^{21011201100220} is an apocalyptic number.

21011201100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011201100220 is an abundant number, since it is smaller than the sum of its proper divisors (23112321210284).

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

21011201100220 is a wasteful number, since it uses less digits than its factorization.

21011201100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050560055020 (or 1050560055018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21011201100220 its reverse (2200110211012), we get a palindrome (23211311311232).

The spelling of 21011201100220 in words is "twenty-one trillion, eleven billion, two hundred one million, one hundred thousand, two hundred twenty".