21112122122210 has 32 divisors (see below), whose sum is σ = 43459976656512. Its totient is φ = 7233554298240.

The previous prime is 21112122122209. The next prime is 21112122122261. The reversal of 21112122122210 is 1222122121112.

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, 101720012 + ... + 101927351.

It is an arithmetic number, because the mean of its divisors is an integer number (1358124270516).

Almost surely, 2^{21112122122210} is an apocalyptic number.

21112122122210 is an abundant number, since it is smaller than the sum of its proper divisors (22347854534302).

21112122122210 is a wasteful number, since it uses less digits than its factorization.

21112122122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203648858.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21112122122210 its reverse (1222122121112), we get a palindrome (22334244243322).

The spelling of 21112122122210 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred ten".