21432145042 has 64 divisors (see below), whose sum is σ = 40981303296. Its totient is φ = 8163020160.

The previous prime is 21432145019. The next prime is 21432145061. The reversal of 21432145042 is 24054123412.

It is a super-2 number, since 2×21432145042² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21432145042.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11992473 + ... + 11994259.

It is an arithmetic number, because the mean of its divisors is an integer number (640332864).

Almost surely, 2^21432145042 is an apocalyptic number.

21432145042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21432145042 is a deficient number, since it is larger than the sum of its proper divisors (19549158254).

21432145042 is a wasteful number, since it uses less digits than its factorization.

21432145042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3511.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 21432145042 its reverse (24054123412), we get a palindrome (45486268454).

The spelling of 21432145042 in words is "twenty-one billion, four hundred thirty-two million, one hundred forty-five thousand, forty-two".