21718528241 has 16 divisors (see below), whose sum is σ = 22762467840. Its totient is φ = 20704619520.

The previous prime is 21718528231. The next prime is 21718528253. The reversal of 21718528241 is 14282581712.

It is a de Polignac number, because none of the positive numbers 2^k-21718528241 is a prime.

It is a super-2 number, since 2×21718528241² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21718528231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279620 + ... + 348746.

It is an arithmetic number, because the mean of its divisors is an integer number (1422654240).

Almost surely, 2^21718528241 is an apocalyptic number.

It is an amenable number.

21718528241 is a deficient number, since it is larger than the sum of its proper divisors (1043939599).

21718528241 is an equidigital number, since it uses as much as digits as its factorization.

21718528241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69344.

The product of its digits is 71680, while the sum is 41.

The spelling of 21718528241 in words is "twenty-one billion, seven hundred eighteen million, five hundred twenty-eight thousand, two hundred forty-one".