21233134140 has 48 divisors (see below), whose sum is σ = 59479088928. Its totient is φ = 5659663104.

The previous prime is 21233134061. The next prime is 21233134183. The reversal of 21233134140 is 4143133212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21233134140.

It is a congruent number.

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, 60414 + ... + 214746.

It is an arithmetic number, because the mean of its divisors is an integer number (1239147686).

Almost surely, 2^21233134140 is an apocalyptic number.

21233134140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233134140 is an abundant number, since it is smaller than the sum of its proper divisors (38245954788).

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

21233134140 is a wasteful number, since it uses less digits than its factorization.

21233134140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156638 (or 156636 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21233134140 its reverse (4143133212), we get a palindrome (25376267352).

The spelling of 21233134140 in words is "twenty-one billion, two hundred thirty-three million, one hundred thirty-four thousand, one hundred forty".