21352103533 has 4 divisors (see below), whose sum is σ = 21872886588. Its totient is φ = 20831320480.

The previous prime is 21352103527. The next prime is 21352103543. The reversal of 21352103533 is 33530125312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3534659209 + 17817444324 = 59453^2 + 133482^2 .

It is a cyclic number.

It is not a de Polignac number, because 21352103533 - 2¹⁷ = 21351972461 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 (21352103503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260391466 + ... + 260391547.

It is an arithmetic number, because the mean of its divisors is an integer number (5468221647).

Almost surely, 2^21352103533 is an apocalyptic number.

It is an amenable number.

21352103533 is a deficient number, since it is larger than the sum of its proper divisors (520783055).

21352103533 is an equidigital number, since it uses as much as digits as its factorization.

21352103533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520783054.

The product of its (nonzero) digits is 8100, while the sum is 28.

Adding to 21352103533 its reverse (33530125312), we get a palindrome (54882228845).

The spelling of 21352103533 in words is "twenty-one billion, three hundred fifty-two million, one hundred three thousand, five hundred thirty-three".