21201223222 has 16 divisors (see below), whose sum is σ = 33280180992. Its totient is φ = 10110486760.

The previous prime is 21201223217. The next prime is 21201223231. The reversal of 21201223222 is 22232210212.

It is a super-2 number, since 2×21201223222² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21201223222.

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, 648154 + ... + 680077.

It is an arithmetic number, because the mean of its divisors is an integer number (2080011312).

Almost surely, 2^21201223222 is an apocalyptic number.

21201223222 is a deficient number, since it is larger than the sum of its proper divisors (12078957770).

21201223222 is a wasteful number, since it uses less digits than its factorization.

21201223222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328603.

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

Adding to 21201223222 its reverse (22232210212), we get a palindrome (43433433434).

The spelling of 21201223222 in words is "twenty-one billion, two hundred one million, two hundred twenty-three thousand, two hundred twenty-two".