21201001332 has 96 divisors (see below), whose sum is σ = 58225348608. Its totient is φ = 5877339264.

The previous prime is 21201001307. The next prime is 21201001379. The reversal of 21201001332 is 23310010212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1131343 + ... + 1149929.

It is an arithmetic number, because the mean of its divisors is an integer number (606514048).

Almost surely, 2^21201001332 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 21201001332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29112674304).

21201001332 is an abundant number, since it is smaller than the sum of its proper divisors (37024347276).

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

21201001332 is a wasteful number, since it uses less digits than its factorization.

21201001332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19005 (or 19003 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21201001332 its reverse (23310010212), we get a palindrome (44511011544).

The spelling of 21201001332 in words is "twenty-one billion, two hundred one million, one thousand, three hundred thirty-two".