21130401732 has 192 divisors, whose sum is σ = 56444387328. Its totient is φ = 6096384000.

The previous prime is 21130401709. The next prime is 21130401749. The reversal of 21130401732 is 23710403112.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48799788 + ... + 48800220.

It is an arithmetic number, because the mean of its divisors is an integer number (293981184).

Almost surely, 2^21130401732 is an apocalyptic number.

21130401732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21130401732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28222193664).

21130401732 is an abundant number, since it is smaller than the sum of its proper divisors (35313985596).

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

21130401732 is a wasteful number, since it uses less digits than its factorization.

21130401732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

Adding to 21130401732 its reverse (23710403112), we get a palindrome (44840804844).

The spelling of 21130401732 in words is "twenty-one billion, one hundred thirty million, four hundred one thousand, seven hundred thirty-two".