21301223112 has 48 divisors (see below), whose sum is σ = 62128570140. Its totient is φ = 6554222208.

The previous prime is 21301223089. The next prime is 21301223113. The reversal of 21301223112 is 21132210312.

It can be written as a sum of positive squares in 2 ways, for example, as 16856867556 + 4444355556 = 129834^2 + 66666^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21301223113) 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, 11377923 + ... + 11379794.

Almost surely, 2^21301223112 is an apocalyptic number.

It is an amenable number.

21301223112 is an abundant number, since it is smaller than the sum of its proper divisors (40827347028).

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

21301223112 is a wasteful number, since it uses less digits than its factorization.

21301223112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22757742 (or 22757735 counting only the distinct ones).

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

Adding to 21301223112 its reverse (21132210312), we get a palindrome (42433433424).

The spelling of 21301223112 in words is "twenty-one billion, three hundred one million, two hundred twenty-three thousand, one hundred twelve".