21988162459 has 8 divisors (see below), whose sum is σ = 22322504448. Its totient is φ = 21654505320.

The previous prime is 21988162447. The next prime is 21988162481. The reversal of 21988162459 is 95426188912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21988162459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21988162409) 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, 106327 + ... + 235120.

It is an arithmetic number, because the mean of its divisors is an integer number (2790313056).

Almost surely, 2^21988162459 is an apocalyptic number.

21988162459 is a deficient number, since it is larger than the sum of its proper divisors (334341989).

21988162459 is an equidigital number, since it uses as much as digits as its factorization.

21988162459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342425.

The product of its digits is 2488320, while the sum is 55.

The spelling of 21988162459 in words is "twenty-one billion, nine hundred eighty-eight million, one hundred sixty-two thousand, four hundred fifty-nine".