21033122112 has 84 divisors (see below), whose sum is σ = 60821354100. Its totient is φ = 6948974592.

The previous prime is 21033122111. The next prime is 21033122129. The reversal of 21033122112 is 21122133012.

It can be written as a sum of positive squares in 2 ways, for example, as 4118558976 + 16914563136 = 64176^2 + 130056^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033122111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96487 + ... + 226662.

Almost surely, 2^21033122112 is an apocalyptic number.

It is an amenable number.

21033122112 is an abundant number, since it is smaller than the sum of its proper divisors (39788231988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21033122112 is a wasteful number, since it uses less digits than its factorization.

21033122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323280 (or 323267 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21033122112 its reverse (21122133012), we get a palindrome (42155255124).

The spelling of 21033122112 in words is "twenty-one billion, thirty-three million, one hundred twenty-two thousand, one hundred twelve".