20021212222 has 32 divisors (see below), whose sum is σ = 34938812160. Its totient is φ = 8503582080.

The previous prime is 20021212207. The next prime is 20021212223. The reversal of 20021212222 is 22221212002.

It is a junction number, because it is equal to n+sod(n) for n = 20021212196 and 20021212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021212223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140578 + ... + 244549.

It is an arithmetic number, because the mean of its divisors is an integer number (1091837880).

Almost surely, 2^20021212222 is an apocalyptic number.

20021212222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20021212222 is a deficient number, since it is larger than the sum of its proper divisors (14917599938).

20021212222 is a wasteful number, since it uses less digits than its factorization.

20021212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385296.

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

Adding to 20021212222 its reverse (22221212002), we get a palindrome (42242424224).

The spelling of 20021212222 in words is "twenty billion, twenty-one million, two hundred twelve thousand, two hundred twenty-two".