21022220013020 has 192 divisors, whose sum is σ = 48190243248000. Its totient is φ = 7685503451136.

The previous prime is 21022220013017. The next prime is 21022220013037. The reversal of 21022220013020 is 2031002222012.

It is a self number, because there is not a number n which added to its sum of digits gives 21022220013020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 122729996 + ... + 122901164.

It is an arithmetic number, because the mean of its divisors is an integer number (250990850250).

Almost surely, 2^{21022220013020} is an apocalyptic number.

21022220013020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022220013020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24095121624000).

21022220013020 is an abundant number, since it is smaller than the sum of its proper divisors (27168023234980).

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

21022220013020 is a wasteful number, since it uses less digits than its factorization.

21022220013020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171400 (or 171398 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21022220013020 its reverse (2031002222012), we get a palindrome (23053222235032).

The spelling of 21022220013020 in words is "twenty-one trillion, twenty-two billion, two hundred twenty million, thirteen thousand, twenty".