21011222012222 has 32 divisors (see below), whose sum is σ = 34598805665760. Its totient is φ = 9509783137920.

The previous prime is 21011222012213. The next prime is 21011222012243. The reversal of 21011222012222 is 22221022211012.

It is a junction number, because it is equal to n+sod(n) for n = 21011222012194 and 21011222012203.

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, 1019897 + ... + 6562212.

It is an arithmetic number, because the mean of its divisors is an integer number (1081212677055).

Almost surely, 2^{21011222012222} is an apocalyptic number.

21011222012222 is a deficient number, since it is larger than the sum of its proper divisors (13587583653538).

21011222012222 is a wasteful number, since it uses less digits than its factorization.

21011222012222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7584188.

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

Adding to 21011222012222 its reverse (22221022211012), we get a palindrome (43232244223234).

The spelling of 21011222012222 in words is "twenty-one trillion, eleven billion, two hundred twenty-two million, twelve thousand, two hundred twenty-two".