21201321232 has 80 divisors (see below), whose sum is σ = 50659257600. Its totient is φ = 8370372096.

The previous prime is 21201321221. The next prime is 21201321263. The reversal of 21201321232 is 23212310212.

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 15 ways as a sum of consecutive naturals, for example, 717894 + ... + 746842.

It is an arithmetic number, because the mean of its divisors is an integer number (633240720).

Almost surely, 2^21201321232 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 21201321232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25329628800).

21201321232 is an abundant number, since it is smaller than the sum of its proper divisors (29457936368).

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

21201321232 is a wasteful number, since it uses less digits than its factorization.

21201321232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29480 (or 29474 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21201321232 its reverse (23212310212), we get a palindrome (44413631444).

The spelling of 21201321232 in words is "twenty-one billion, two hundred one million, three hundred twenty-one thousand, two hundred thirty-two".