21420444034 has 8 divisors (see below), whose sum is σ = 35051635728. Its totient is φ = 9736565460.

The previous prime is 21420444011. The next prime is 21420444047. The reversal of 21420444034 is 43044402412.

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

It is a super-2 number, since 2×21420444034² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21420443993 and 21420444011.

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, 486828252 + ... + 486828295.

It is an arithmetic number, because the mean of its divisors is an integer number (4381454466).

Almost surely, 2^21420444034 is an apocalyptic number.

21420444034 is a deficient number, since it is larger than the sum of its proper divisors (13631191694).

21420444034 is a wasteful number, since it uses less digits than its factorization.

21420444034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973656560.

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21420444034 its reverse (43044402412), we get a palindrome (64464846446).

The spelling of 21420444034 in words is "twenty-one billion, four hundred twenty million, four hundred forty-four thousand, thirty-four".