21301244432 has 80 divisors (see below), whose sum is σ = 47127816960. Its totient is φ = 9245684736.

The previous prime is 21301244431. The next prime is 21301244441. The reversal of 21301244432 is 23444210312.

It is a super-2 number, since 2×21301244432² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (21301244431) 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, 521753 + ... + 561095.

It is an arithmetic number, because the mean of its divisors is an integer number (589097712).

Almost surely, 2^21301244432 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 21301244432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23563908480).

21301244432 is an abundant number, since it is smaller than the sum of its proper divisors (25826572528).

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

21301244432 is a wasteful number, since it uses less digits than its factorization.

21301244432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39520 (or 39514 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21301244432 its reverse (23444210312), we get a palindrome (44745454744).

The spelling of 21301244432 in words is "twenty-one billion, three hundred one million, two hundred forty-four thousand, four hundred thirty-two".