21201110222222 has 32 divisors (see below), whose sum is σ = 37938713333760. Its totient is φ = 8694288440640.

The previous prime is 21201110222219. The next prime is 21201110222251. The reversal of 21201110222222 is 22222201110212.

It is a junction number, because it is equal to n+sod(n) for n = 21201110222194 and 21201110222203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274402298 + ... + 274479549.

It is an arithmetic number, because the mean of its divisors is an integer number (1185584791680).

Almost surely, 2^{21201110222222} is an apocalyptic number.

21201110222222 is a deficient number, since it is larger than the sum of its proper divisors (16737603111538).

21201110222222 is a wasteful number, since it uses less digits than its factorization.

21201110222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548881976.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21201110222222 its reverse (22222201110212), we get a palindrome (43423311332434).

The spelling of 21201110222222 in words is "twenty-one trillion, two hundred one billion, one hundred ten million, two hundred twenty-two thousand, two hundred twenty-two".