21641211154 has 8 divisors (see below), whose sum is σ = 32463358848. Its totient is φ = 10820091540.

The previous prime is 21641211127. The next prime is 21641211173. The reversal of 21641211154 is 45111214612.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202042 + ... + 290005.

It is an arithmetic number, because the mean of its divisors is an integer number (4057919856).

Almost surely, 2^21641211154 is an apocalyptic number.

21641211154 is a deficient number, since it is larger than the sum of its proper divisors (10822147694).

21641211154 is a wasteful number, since it uses less digits than its factorization.

21641211154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514040.

The product of its digits is 1920, while the sum is 28.

Adding to 21641211154 its reverse (45111214612), we get a palindrome (66752425766).

The spelling of 21641211154 in words is "twenty-one billion, six hundred forty-one million, two hundred eleven thousand, one hundred fifty-four".