221000001222 has 128 divisors (see below), whose sum is σ = 609494473728. Its totient is φ = 51554880000.

The previous prime is 221000001197. The next prime is 221000001283. The reversal of 221000001222 is 222100000122.

It is a junction number, because it is equal to n+sod(n) for n = 221000001198 and 221000001207.

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, 275029 + ... + 719472.

It is an arithmetic number, because the mean of its divisors is an integer number (4761675576).

Almost surely, 2^221000001222 is an apocalyptic number.

221000001222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221000001222 is an abundant number, since it is smaller than the sum of its proper divisors (388494472506).

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

221000001222 is a wasteful number, since it uses less digits than its factorization.

221000001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994574.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 221000001222 its reverse (222100000122), we get a palindrome (443100001344).

It can be divided in two parts, 22100000122 and 2, that multiplied together give a palindrome (44200000244).

The spelling of 221000001222 in words is "two hundred twenty-one billion, one thousand, two hundred twenty-two".