21233045531 has 2 divisors, whose sum is σ = 21233045532. Its totient is φ = 21233045530.

The previous prime is 21233045513. The next prime is 21233045597. The reversal of 21233045531 is 13554033212.

It is a happy number.

Together with previous prime (21233045513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21233045531 - 2³⁰ = 20159303707 is a prime.

It is a super-2 number, since 2×21233045531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21233045494 and 21233045503.

It is not a weakly prime, because it can be changed into another prime (21233045131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616522765 + 10616522766.

It is an arithmetic number, because the mean of its divisors is an integer number (10616522766).

Almost surely, 2^21233045531 is an apocalyptic number.

21233045531 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233045531 is an equidigital number, since it uses as much as digits as its factorization.

21233045531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 21233045531 its reverse (13554033212), we get a palindrome (34787078743).

The spelling of 21233045531 in words is "twenty-one billion, two hundred thirty-three million, forty-five thousand, five hundred thirty-one".