21154303154 has 8 divisors (see below), whose sum is σ = 31770680220. Its totient is φ = 10564076416.

The previous prime is 21154303147. The next prime is 21154303207. The reversal of 21154303154 is 45130345112.

It can be written as a sum of positive squares in 2 ways, for example, as 18775302529 + 2379000625 = 137023^2 + 48775^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6535559 + ... + 6538794.

Almost surely, 2^21154303154 is an apocalyptic number.

21154303154 is a deficient number, since it is larger than the sum of its proper divisors (10616377066).

21154303154 is a wasteful number, since it uses less digits than its factorization.

21154303154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13075164.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21154303154 its reverse (45130345112), we get a palindrome (66284648266).

The spelling of 21154303154 in words is "twenty-one billion, one hundred fifty-four million, three hundred three thousand, one hundred fifty-four".