21451055289 has 8 divisors (see below), whose sum is σ = 28674934080. Its totient is φ = 14263940016.

The previous prime is 21451055281. The next prime is 21451055303. The reversal of 21451055289 is 98255015412.

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

It is not a de Polignac number, because 21451055289 - 2³ = 21451055281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21451055289.

It is not an unprimeable number, because it can be changed into a prime (21451055281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9189517 + ... + 9191850.

It is an arithmetic number, because the mean of its divisors is an integer number (3584366760).

Almost surely, 2^21451055289 is an apocalyptic number.

It is an amenable number.

21451055289 is a deficient number, since it is larger than the sum of its proper divisors (7223878791).

21451055289 is a wasteful number, since it uses less digits than its factorization.

21451055289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18381759.

The product of its (nonzero) digits is 144000, while the sum is 42.

The spelling of 21451055289 in words is "twenty-one billion, four hundred fifty-one million, fifty-five thousand, two hundred eighty-nine".