21434231442 has 64 divisors (see below), whose sum is σ = 46502265600. Its totient is φ = 6547267584.

The previous prime is 21434231411. The next prime is 21434231443. The reversal of 21434231442 is 24413243412.

It is not an unprimeable number, because it can be changed into a prime (21434231443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9016158 + ... + 9018534.

It is an arithmetic number, because the mean of its divisors is an integer number (726597900).

Almost surely, 2^21434231442 is an apocalyptic number.

21434231442 is an abundant number, since it is smaller than the sum of its proper divisors (25068034158).

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

21434231442 is a wasteful number, since it uses less digits than its factorization.

21434231442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187.

The product of its digits is 18432, while the sum is 30.

Adding to 21434231442 its reverse (24413243412), we get a palindrome (45847474854).

The spelling of 21434231442 in words is "twenty-one billion, four hundred thirty-four million, two hundred thirty-one thousand, four hundred forty-two".