21001203132 has 192 divisors, whose sum is σ = 61018481664. Its totient is φ = 5474304000.

The previous prime is 21001203109. The next prime is 21001203149. The reversal of 21001203132 is 23130210012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 52899558 + ... + 52899954.

It is an arithmetic number, because the mean of its divisors is an integer number (317804592).

Almost surely, 2^21001203132 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 21001203132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30509240832).

21001203132 is an abundant number, since it is smaller than the sum of its proper divisors (40017278532).

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

21001203132 is a wasteful number, since it uses less digits than its factorization.

21001203132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868 (or 866 counting only the distinct ones).

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

Adding to 21001203132 its reverse (23130210012), we get a palindrome (44131413144).

The spelling of 21001203132 in words is "twenty-one billion, one million, two hundred three thousand, one hundred thirty-two".