21003311232 has 256 divisors, whose sum is σ = 65875680000. Its totient is φ = 6565183488.

The previous prime is 21003311209. The next prime is 21003311233. The reversal of 21003311232 is 23211330012.

21003311232 is a `hidden beast` number, since 2 + 100 + 331 + 1 + 232 = 666.

It is a super-2 number, since 2×21003311232² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21003311233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22854069 + ... + 22854987.

It is an arithmetic number, because the mean of its divisors is an integer number (257326875).

Almost surely, 2^21003311232 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 21003311232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32937840000).

21003311232 is an abundant number, since it is smaller than the sum of its proper divisors (44872368768).

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

21003311232 is a wasteful number, since it uses less digits than its factorization.

21003311232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21003311232 its reverse (23211330012), we get a palindrome (44214641244).

The spelling of 21003311232 in words is "twenty-one billion, three million, three hundred eleven thousand, two hundred thirty-two".