21433453436 has 12 divisors (see below), whose sum is σ = 37521944712. Its totient is φ = 10712897808.

The previous prime is 21433453411. The next prime is 21433453441. The reversal of 21433453436 is 63435433412.

It is a self number, because there is not a number n which added to its sum of digits gives 21433453436.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 944615 + ... + 967038.

It is an arithmetic number, because the mean of its divisors is an integer number (3126828726).

Almost surely, 2^21433453436 is an apocalyptic number.

It is an amenable number.

21433453436 is a deficient number, since it is larger than the sum of its proper divisors (16088491276).

21433453436 is a wasteful number, since it uses less digits than its factorization.

21433453436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914460 (or 1914458 counting only the distinct ones).

The product of its digits is 311040, while the sum is 38.

Adding to 21433453436 its reverse (63435433412), we get a palindrome (84868886848).

The spelling of 21433453436 in words is "twenty-one billion, four hundred thirty-three million, four hundred fifty-three thousand, four hundred thirty-six".