20001221222 has 16 divisors (see below), whose sum is σ = 31318002432. Its totient is φ = 9562213320.

The previous prime is 20001221171. The next prime is 20001221231. The reversal of 20001221222 is 22212210002.

It is a junction number, because it is equal to n+sod(n) for n = 20001221197 and 20001221206.

It is a congruent number.

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, 44513 + ... + 204899.

It is an arithmetic number, because the mean of its divisors is an integer number (1957375152).

Almost surely, 2^20001221222 is an apocalyptic number.

20001221222 is a deficient number, since it is larger than the sum of its proper divisors (11316781210).

20001221222 is a wasteful number, since it uses less digits than its factorization.

20001221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163123.

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

Adding to 20001221222 its reverse (22212210002), we get a palindrome (42213431224).

The spelling of 20001221222 in words is "twenty billion, one million, two hundred twenty-one thousand, two hundred twenty-two".