21443204234 has 8 divisors (see below), whose sum is σ = 32239435968. Its totient is φ = 10696725580.

The previous prime is 21443204219. The next prime is 21443204261. The reversal of 21443204234 is 43240234412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21443204234² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21443204197 and 21443204206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12437192 + ... + 12438915.

It is an arithmetic number, because the mean of its divisors is an integer number (4029929496).

Almost surely, 2^21443204234 is an apocalyptic number.

21443204234 is a deficient number, since it is larger than the sum of its proper divisors (10796231734).

21443204234 is a wasteful number, since it uses less digits than its factorization.

21443204234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24876540.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 21443204234 its reverse (43240234412), we get a palindrome (64683438646).

The spelling of 21443204234 in words is "twenty-one billion, four hundred forty-three million, two hundred four thousand, two hundred thirty-four".