21233154140 has 48 divisors (see below), whose sum is σ = 48953134944. Its totient is φ = 7671955200.

The previous prime is 21233154127. The next prime is 21233154143. The reversal of 21233154140 is 4145133212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233154143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272831 + ... + 341910.

It is an arithmetic number, because the mean of its divisors is an integer number (1019856978).

Almost surely, 2^21233154140 is an apocalyptic number.

21233154140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233154140 is an abundant number, since it is smaller than the sum of its proper divisors (27719980804).

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

21233154140 is a wasteful number, since it uses less digits than its factorization.

21233154140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614918 (or 614916 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21233154140 its reverse (4145133212), we get a palindrome (25378287352).

The spelling of 21233154140 in words is "twenty-one billion, two hundred thirty-three million, one hundred fifty-four thousand, one hundred forty".