21245230532 has 12 divisors (see below), whose sum is σ = 39135951120. Its totient is φ = 10063530216.

The previous prime is 21245230519. The next prime is 21245230537. The reversal of 21245230532 is 23503254212.

It is a junction number, because it is equal to n+sod(n) for n = 21245230495 and 21245230504.

It is not an unprimeable number, because it can be changed into a prime (21245230537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139771178 + ... + 139771329.

It is an arithmetic number, because the mean of its divisors is an integer number (3261329260).

Almost surely, 2^21245230532 is an apocalyptic number.

It is an amenable number.

21245230532 is a deficient number, since it is larger than the sum of its proper divisors (17890720588).

21245230532 is a wasteful number, since it uses less digits than its factorization.

21245230532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279542530 (or 279542528 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 21245230532 its reverse (23503254212), we get a palindrome (44748484744).

The spelling of 21245230532 in words is "twenty-one billion, two hundred forty-five million, two hundred thirty thousand, five hundred thirty-two".