21132432330 has 16 divisors (see below), whose sum is σ = 50717837664. Its totient is φ = 5635315280.

The previous prime is 21132432329. The next prime is 21132432331. The reversal of 21132432330 is 3323423112.

It is an interprime number because it is at equal distance from previous prime (21132432329) and next prime (21132432331).

It is a self number, because there is not a number n which added to its sum of digits gives 21132432330.

It is not an unprimeable number, because it can be changed into a prime (21132432331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352207176 + ... + 352207235.

It is an arithmetic number, because the mean of its divisors is an integer number (3169864854).

Almost surely, 2^21132432330 is an apocalyptic number.

21132432330 is an abundant number, since it is smaller than the sum of its proper divisors (29585405334).

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

21132432330 is a wasteful number, since it uses less digits than its factorization.

21132432330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704414421.

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

Adding to 21132432330 its reverse (3323423112), we get a palindrome (24455855442).

The spelling of 21132432330 in words is "twenty-one billion, one hundred thirty-two million, four hundred thirty-two thousand, three hundred thirty".