21220021222 has 16 divisors (see below), whose sum is σ = 31878418752. Its totient is φ = 10593896040.

The previous prime is 21220021157. The next prime is 21220021223. The reversal of 21220021222 is 22212002212.

It is a junction number, because it is equal to n+sod(n) for n = 21220021196 and 21220021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220021223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6656713 + ... + 6659899.

It is an arithmetic number, because the mean of its divisors is an integer number (1992401172).

Almost surely, 2^21220021222 is an apocalyptic number.

21220021222 is a deficient number, since it is larger than the sum of its proper divisors (10658397530).

21220021222 is a wasteful number, since it uses less digits than its factorization.

21220021222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7203.

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

Adding to 21220021222 its reverse (22212002212), we get a palindrome (43432023434).

The spelling of 21220021222 in words is "twenty-one billion, two hundred twenty million, twenty-one thousand, two hundred twenty-two".