21233101312 has 160 divisors (see below), whose sum is σ = 46472025600. Its totient is φ = 9654681600.

The previous prime is 21233101301. The next prime is 21233101321. The reversal of 21233101312 is 21310133212.

It is a super-2 number, since 2×21233101312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21233101312.

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, 54583614 + ... + 54584002.

It is an arithmetic number, because the mean of its divisors is an integer number (290450160).

Almost surely, 2^21233101312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21233101312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23236012800).

21233101312 is an abundant number, since it is smaller than the sum of its proper divisors (25238924288).

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

21233101312 is a wasteful number, since it uses less digits than its factorization.

21233101312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21233101312 its reverse (21310133212), we get a palindrome (42543234524).

The spelling of 21233101312 in words is "twenty-one billion, two hundred thirty-three million, one hundred one thousand, three hundred twelve".