221220021122 has 16 divisors (see below), whose sum is σ = 340492870080. Its totient is φ = 107736729072.

The previous prime is 221220021119. The next prime is 221220021151. The reversal of 221220021122 is 221120022122.

It is a happy number.

It is a super-2 number, since 2×221220021122² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221220021122.

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, 3551753 + ... + 3613500.

It is an arithmetic number, because the mean of its divisors is an integer number (21280804380).

Almost surely, 2^221220021122 is an apocalyptic number.

221220021122 is a deficient number, since it is larger than the sum of its proper divisors (119272848958).

221220021122 is a wasteful number, since it uses less digits than its factorization.

221220021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7165657.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221220021122 its reverse (221120022122), we get a palindrome (442340043244).

It can be divided in two parts, 2212200 and 21122, that added together give a palindrome (2233322).

The spelling of 221220021122 in words is "two hundred twenty-one billion, two hundred twenty million, twenty-one thousand, one hundred twenty-two".