21423231330 has 32 divisors (see below), whose sum is σ = 51445412928. Its totient is φ = 5709566400.

The previous prime is 21423231227. The next prime is 21423231331. The reversal of 21423231330 is 3313232412.

It is a self number, because there is not a number n which added to its sum of digits gives 21423231330.

It is not an unprimeable number, because it can be changed into a prime (21423231331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152856 + ... + 257315.

It is an arithmetic number, because the mean of its divisors is an integer number (1607669154).

Almost surely, 2^21423231330 is an apocalyptic number.

21423231330 is an abundant number, since it is smaller than the sum of its proper divisors (30022181598).

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

21423231330 is a wasteful number, since it uses less digits than its factorization.

21423231330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411922.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21423231330 its reverse (3313232412), we get a palindrome (24736463742).

The spelling of 21423231330 in words is "twenty-one billion, four hundred twenty-three million, two hundred thirty-one thousand, three hundred thirty".