21523002133 has 8 divisors (see below), whose sum is σ = 22837868352. Its totient is φ = 20213558976.

The previous prime is 21523002071. The next prime is 21523002139. The reversal of 21523002133 is 33120032512.

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 21523002133 - 2²⁵ = 21489447701 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 (21523002139) 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, 1347585 + ... + 1363462.

It is an arithmetic number, because the mean of its divisors is an integer number (2854733544).

Almost surely, 2^21523002133 is an apocalyptic number.

It is an amenable number.

21523002133 is a deficient number, since it is larger than the sum of its proper divisors (1314866219).

21523002133 is a wasteful number, since it uses less digits than its factorization.

21523002133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2711531.

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

Adding to 21523002133 its reverse (33120032512), we get a palindrome (54643034645).

The spelling of 21523002133 in words is "twenty-one billion, five hundred twenty-three million, two thousand, one hundred thirty-three".