21530532433033 has 4 divisors (see below), whose sum is σ = 23186727235588. Its totient is φ = 19874337630480.

The previous prime is 21530532432977. The next prime is 21530532433037. The reversal of 21530532433033 is 33033423503512.

It is a happy number.

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 1516030737984 + 20014501695049 = 1231272^2 + 4473757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21530532433033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21530532432983 and 21530532433001.

It is not an unprimeable number, because it can be changed into a prime (21530532433037) 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, 828097401258 + ... + 828097401283.

It is an arithmetic number, because the mean of its divisors is an integer number (5796681808897).

Almost surely, 2^{21530532433033} is an apocalyptic number.

It is an amenable number.

21530532433033 is a deficient number, since it is larger than the sum of its proper divisors (1656194802555).

21530532433033 is a wasteful number, since it uses less digits than its factorization.

21530532433033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656194802554.

The product of its (nonzero) digits is 291600, while the sum is 37.

Adding to 21530532433033 its reverse (33033423503512), we get a palindrome (54563955936545).

The spelling of 21530532433033 in words is "twenty-one trillion, five hundred thirty billion, five hundred thirty-two million, four hundred thirty-three thousand, thirty-three".