21101112122 has 4 divisors (see below), whose sum is σ = 31651668186. Its totient is φ = 10550556060.

The previous prime is 21101112119. The next prime is 21101112127. The reversal of 21101112122 is 22121110112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19459971001 + 1641141121 = 139499^2 + 40511^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21101112097 and 21101112106.

It is not an unprimeable number, because it can be changed into a prime (21101112127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275278029 + ... + 5275278032.

Almost surely, 2^21101112122 is an apocalyptic number.

21101112122 is a deficient number, since it is larger than the sum of its proper divisors (10550556064).

21101112122 is a wasteful number, since it uses less digits than its factorization.

21101112122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10550556063.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21101112122 its reverse (22121110112), we get a palindrome (43222222234).

The spelling of 21101112122 in words is "twenty-one billion, one hundred one million, one hundred twelve thousand, one hundred twenty-two".