21614558789 has 4 divisors (see below), whose sum is σ = 21633338880. Its totient is φ = 21595778700.

The previous prime is 21614558743. The next prime is 21614558813. The reversal of 21614558789 is 98785541612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21614558789 - 2⁸ = 21614558533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21614558989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9388319 + ... + 9390620.

It is an arithmetic number, because the mean of its divisors is an integer number (5408334720).

Almost surely, 2^21614558789 is an apocalyptic number.

It is an amenable number.

21614558789 is a deficient number, since it is larger than the sum of its proper divisors (18780091).

21614558789 is a wasteful number, since it uses less digits than its factorization.

21614558789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18780090.

The product of its digits is 4838400, while the sum is 56.

The spelling of 21614558789 in words is "twenty-one billion, six hundred fourteen million, five hundred fifty-eight thousand, seven hundred eighty-nine".