21321414434 has 4 divisors (see below), whose sum is σ = 31982121654. Its totient is φ = 10660707216.

The previous prime is 21321414419. The next prime is 21321414473. The reversal of 21321414434 is 43441412312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17714811409 + 3606603025 = 133097^2 + 60055^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21321414397 and 21321414406.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330353607 + ... + 5330353610.

Almost surely, 2^21321414434 is an apocalyptic number.

21321414434 is a deficient number, since it is larger than the sum of its proper divisors (10660707220).

21321414434 is a wasteful number, since it uses less digits than its factorization.

21321414434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10660707219.

The product of its digits is 9216, while the sum is 29.

Adding to 21321414434 its reverse (43441412312), we get a palindrome (64762826746).

The spelling of 21321414434 in words is "twenty-one billion, three hundred twenty-one million, four hundred fourteen thousand, four hundred thirty-four".