221000222001020 has 192 divisors, whose sum is σ = 598605836774400. Its totient is φ = 66504047984640.

The previous prime is 221000222001017. The next prime is 221000222001061. The reversal of 221000222001020 is 20100222000122.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 221000222000986 and 221000222001004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 823083551 + ... + 823352009.

It is an arithmetic number, because the mean of its divisors is an integer number (3117738733200).

Almost surely, 2^{221000222001020} is an apocalyptic number.

221000222001020 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 221000222001020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299302918387200).

221000222001020 is an abundant number, since it is smaller than the sum of its proper divisors (377605614773380).

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

221000222001020 is a wasteful number, since it uses less digits than its factorization.

221000222001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286948 (or 286946 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 221000222001020 its reverse (20100222000122), we get a palindrome (241100444001142).

The spelling of 221000222001020 in words is "two hundred twenty-one trillion, two hundred twenty-two million, one thousand, twenty".