21220022021020 has 24 divisors (see below), whose sum is σ = 44563785107184. Its totient is φ = 8487677596416.

The previous prime is 21220022020979. The next prime is 21220022021053. The reversal of 21220022021020 is 2012022002212.

It is a junction number, because it is equal to n+sod(n) for n = 21220022020985 and 21220022021003.

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, 20175069 + ... + 21200788.

It is an arithmetic number, because the mean of its divisors is an integer number (1856824379466).

Almost surely, 2^{21220022021020} is an apocalyptic number.

21220022021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220022021020 is an abundant number, since it is smaller than the sum of its proper divisors (23343763086164).

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

21220022021020 is a wasteful number, since it uses less digits than its factorization.

21220022021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41401509 (or 41401507 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21220022021020 its reverse (2012022002212), we get a palindrome (23232044023232).

The spelling of 21220022021020 in words is "twenty-one trillion, two hundred twenty billion, twenty-two million, twenty-one thousand, twenty".