21532023013 has 8 divisors (see below), whose sum is σ = 23354677080. Its totient is φ = 19771153920.

The previous prime is 21532022971. The next prime is 21532023041. The reversal of 21532023013 is 31032023512.

It can be written as a sum of positive squares in 4 ways, for example, as 1247996929 + 20284026084 = 35327^2 + 142422^2 .

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 21532023013 - 2¹³ = 21532014821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532023083) 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, 15445518 + ... + 15446911.

It is an arithmetic number, because the mean of its divisors is an integer number (2919334635).

Almost surely, 2^21532023013 is an apocalyptic number.

It is an amenable number.

21532023013 is a deficient number, since it is larger than the sum of its proper divisors (1822654067).

21532023013 is a wasteful number, since it uses less digits than its factorization.

21532023013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30892487.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21532023013 its reverse (31032023512), we get a palindrome (52564046525).

The spelling of 21532023013 in words is "twenty-one billion, five hundred thirty-two million, twenty-three thousand, thirteen".