21430442112 has 32 divisors (see below), whose sum is σ = 56924612880. Its totient is φ = 7143480576.

The previous prime is 21430442093. The next prime is 21430442113. The reversal of 21430442112 is 21124403412.

It is a tau number, because it is divible by the number of its divisors (32).

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

It is not an unprimeable number, because it can be changed into a prime (21430442113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27903838 + ... + 27904605.

Almost surely, 2^21430442112 is an apocalyptic number.

It is an amenable number.

21430442112 is an abundant number, since it is smaller than the sum of its proper divisors (35494170768).

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

21430442112 is an equidigital number, since it uses as much as digits as its factorization.

21430442112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55808460 (or 55808448 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21430442112 its reverse (21124403412), we get a palindrome (42554845524).

The spelling of 21430442112 in words is "twenty-one billion, four hundred thirty million, four hundred forty-two thousand, one hundred twelve".