21200122012112 has 20 divisors (see below), whose sum is σ = 41080403991300. Its totient is φ = 10598727433728.

The previous prime is 21200122012103. The next prime is 21200122012213. The reversal of 21200122012112 is 21121022100212.

It can be written as a sum of positive squares in 2 ways, for example, as 4877843285056 + 16322278727056 = 2208584^2 + 4040084^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83217113 + ... + 83471480.

It is an arithmetic number, because the mean of its divisors is an integer number (2054020199565).

Almost surely, 2^{21200122012112} is an apocalyptic number.

It is an amenable number.

21200122012112 is a deficient number, since it is larger than the sum of its proper divisors (19880281979188).

21200122012112 is a wasteful number, since it uses less digits than its factorization.

21200122012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166696550 (or 166696544 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21200122012112 its reverse (21121022100212), we get a palindrome (42321144112324).

The spelling of 21200122012112 in words is "twenty-one trillion, two hundred billion, one hundred twenty-two million, twelve thousand, one hundred twelve".