21532000231 has 4 divisors (see below), whose sum is σ = 24608000272. Its totient is φ = 18456000192.

The previous prime is 21532000223. The next prime is 21532000253. The reversal of 21532000231 is 13200023512.

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

It is not a de Polignac number, because 21532000231 - 2³ = 21532000223 is a prime.

It is a super-2 number, since 2×21532000231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21532000199 and 21532000208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532000201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1538000010 + ... + 1538000023.

It is an arithmetic number, because the mean of its divisors is an integer number (6152000068).

Almost surely, 2^21532000231 is an apocalyptic number.

21532000231 is a deficient number, since it is larger than the sum of its proper divisors (3076000041).

21532000231 is an equidigital number, since it uses as much as digits as its factorization.

21532000231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076000040.

The product of its (nonzero) digits is 360, while the sum is 19.

Adding to 21532000231 its reverse (13200023512), we get a palindrome (34732023743).

The spelling of 21532000231 in words is "twenty-one billion, five hundred thirty-two million, two hundred thirty-one", and thus it is an aban number.