20012221222 has 24 divisors (see below), whose sum is σ = 35045393904. Its totient is φ = 8545691952.

The previous prime is 20012221153. The next prime is 20012221231. The reversal of 20012221222 is 22212221002.

It is a junction number, because it is equal to n+sod(n) for n = 20012221196 and 20012221205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 341458 + ... + 395749.

It is an arithmetic number, because the mean of its divisors is an integer number (1460224746).

Almost surely, 2^20012221222 is an apocalyptic number.

20012221222 is a deficient number, since it is larger than the sum of its proper divisors (15033172682).

20012221222 is a wasteful number, since it uses less digits than its factorization.

20012221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737500 (or 737493 counting only the distinct ones).

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

Adding to 20012221222 its reverse (22212221002), we get a palindrome (42224442224).

The spelling of 20012221222 in words is "twenty billion, twelve million, two hundred twenty-one thousand, two hundred twenty-two".