21254143589 has 4 divisors (see below), whose sum is σ = 24290449824. Its totient is φ = 18217837356.

The previous prime is 21254143571. The next prime is 21254143619. The reversal of 21254143589 is 98534145212.

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 a de Polignac number, because none of the positive numbers 2^k-21254143589 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 (21254143289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1518153107 + ... + 1518153120.

It is an arithmetic number, because the mean of its divisors is an integer number (6072612456).

Almost surely, 2^21254143589 is an apocalyptic number.

It is an amenable number.

21254143589 is a deficient number, since it is larger than the sum of its proper divisors (3036306235).

21254143589 is an equidigital number, since it uses as much as digits as its factorization.

21254143589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036306234.

The product of its digits is 345600, while the sum is 44.

The spelling of 21254143589 in words is "twenty-one billion, two hundred fifty-four million, one hundred forty-three thousand, five hundred eighty-nine".