221222012020 has 12 divisors (see below), whose sum is σ = 464566225284. Its totient is φ = 88488804800.

The previous prime is 221222012017. The next prime is 221222012057. The reversal of 221222012020 is 20210222122.

It can be written as a sum of positive squares in 2 ways, for example, as 37328558436 + 183893453584 = 193206^2 + 428828^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221222011985 and 221222012003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5530550281 + ... + 5530550320.

It is an arithmetic number, because the mean of its divisors is an integer number (38713852107).

Almost surely, 2^221222012020 is an apocalyptic number.

221222012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222012020 is an abundant number, since it is smaller than the sum of its proper divisors (243344213264).

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

221222012020 is a wasteful number, since it uses less digits than its factorization.

221222012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11061100610 (or 11061100608 counting only the distinct ones).

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

Adding to 221222012020 its reverse (20210222122), we get a palindrome (241432234142).

The spelling of 221222012020 in words is "two hundred twenty-one billion, two hundred twenty-two million, twelve thousand, twenty".