21220011201020 has 24 divisors (see below), whose sum is σ = 44590791840000. Its totient is φ = 8482524800832.

The previous prime is 21220011201007. The next prime is 21220011201089. The reversal of 21220011201020 is 2010211002212.

It is a junction number, because it is equal to n+sod(n) for n = 21220011200986 and 21220011201004.

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, 342448220 + ... + 342510179.

It is an arithmetic number, because the mean of its divisors is an integer number (1857949660000).

Almost surely, 2^{21220011201020} is an apocalyptic number.

21220011201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220011201020 is an abundant number, since it is smaller than the sum of its proper divisors (23370780638980).

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

21220011201020 is a wasteful number, since it uses less digits than its factorization.

21220011201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684959957 (or 684959955 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220011201020 its reverse (2010211002212), we get a palindrome (23230222203232).

The spelling of 21220011201020 in words is "twenty-one trillion, two hundred twenty billion, eleven million, two hundred one thousand, twenty".