21132301021 has 8 divisors (see below), whose sum is σ = 22768786040. Its totient is φ = 19497376512.

The previous prime is 21132300997. The next prime is 21132301037. The reversal of 21132301021 is 12010323112.

It can be written as a sum of positive squares in 4 ways, for example, as 5359704100 + 15772596921 = 73210^2 + 125589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21132301021 - 2¹⁵ = 21132268253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21132300986 and 21132301004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132301321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361920 + ... + 416233.

It is an arithmetic number, because the mean of its divisors is an integer number (2846098255).

Almost surely, 2^21132301021 is an apocalyptic number.

It is an amenable number.

21132301021 is a deficient number, since it is larger than the sum of its proper divisors (1636485019).

21132301021 is a wasteful number, since it uses less digits than its factorization.

21132301021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780255.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21132301021 its reverse (12010323112), we get a palindrome (33142624133).

The spelling of 21132301021 in words is "twenty-one billion, one hundred thirty-two million, three hundred one thousand, twenty-one".