2221202221020 has 144 divisors (see below), whose sum is σ = 6938304653280. Its totient is φ = 574766212608.

The previous prime is 2221202221013. The next prime is 2221202221037. The reversal of 2221202221020 is 201222021222.

2221202221020 is a `hidden beast` number, since 2 + 221 + 202 + 221 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2221202220984 and 2221202221002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2037111 + ... + 2931249.

Almost surely, 2^{2221202221020} is an apocalyptic number.

2221202221020 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 2221202221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3469152326640).

2221202221020 is an abundant number, since it is smaller than the sum of its proper divisors (4717102432260).

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

2221202221020 is a wasteful number, since it uses less digits than its factorization.

2221202221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894564 (or 894559 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 2221202221020 its reverse (201222021222), we get a palindrome (2422424242242).

The spelling of 2221202221020 in words is "two trillion, two hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, twenty".