21231230352 has 40 divisors (see below), whose sum is σ = 54852920736. Its totient is φ = 7076357376.

The previous prime is 21231230347. The next prime is 21231230389. The reversal of 21231230352 is 25303213212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 682563 + ... + 712989.

Almost surely, 2^21231230352 is an apocalyptic number.

It is an amenable number.

21231230352 is an abundant number, since it is smaller than the sum of its proper divisors (33621690384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21231230352 is a wasteful number, since it uses less digits than its factorization.

21231230352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44975 (or 44969 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21231230352 its reverse (25303213212), we get a palindrome (46534443564).

The spelling of 21231230352 in words is "twenty-one billion, two hundred thirty-one million, two hundred thirty thousand, three hundred fifty-two".