21334454655 has 16 divisors (see below), whose sum is σ = 35619264000. Its totient is φ = 10883663648.

The previous prime is 21334454641. The next prime is 21334454663. The reversal of 21334454655 is 55645443312.

It is a cyclic number.

It is not a de Polignac number, because 21334454655 - 2⁷ = 21334454527 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30919155 + ... + 30919844.

It is an arithmetic number, because the mean of its divisors is an integer number (2226204000).

Almost surely, 2^21334454655 is an apocalyptic number.

21334454655 is a deficient number, since it is larger than the sum of its proper divisors (14284809345).

21334454655 is a wasteful number, since it uses less digits than its factorization.

21334454655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61839030.

The product of its digits is 864000, while the sum is 42.

Adding to 21334454655 its reverse (55645443312), we get a palindrome (76979897967).

The spelling of 21334454655 in words is "twenty-one billion, three hundred thirty-four million, four hundred fifty-four thousand, six hundred fifty-five".