21532430531531 has 6 divisors (see below), whose sum is σ = 22725362971332. Its totient is φ = 20399144713740.

The previous prime is 21532430531471. The next prime is 21532430531603. The reversal of 21532430531531 is 13513503423512.

It is not a de Polignac number, because 21532430531531 - 2¹⁸ = 21532430269387 is a prime.

It is a super-2 number, since 2×21532430531531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21532430531231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29823310625 + ... + 29823311346.

It is an arithmetic number, because the mean of its divisors is an integer number (3787560495222).

Almost surely, 2^{21532430531531} is an apocalyptic number.

21532430531531 is a deficient number, since it is larger than the sum of its proper divisors (1192932439801).

21532430531531 is an equidigital number, since it uses as much as digits as its factorization.

21532430531531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59646622009 (or 59646621990 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 38.

The spelling of 21532430531531 in words is "twenty-one trillion, five hundred thirty-two billion, four hundred thirty million, five hundred thirty-one thousand, five hundred thirty-one".