21203212222 has 16 divisors (see below), whose sum is σ = 33494832000. Its totient is φ = 10038804120.

The previous prime is 21203212201. The next prime is 21203212253. The reversal of 21203212222 is 22221230212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21203212222.

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, 53154 + ... + 212677.

It is an arithmetic number, because the mean of its divisors is an integer number (2093427000).

Almost surely, 2^21203212222 is an apocalyptic number.

21203212222 is a deficient number, since it is larger than the sum of its proper divisors (12291619778).

21203212222 is a wasteful number, since it uses less digits than its factorization.

21203212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267951.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21203212222 its reverse (22221230212), we get a palindrome (43424442434).

The spelling of 21203212222 in words is "twenty-one billion, two hundred three million, two hundred twelve thousand, two hundred twenty-two".