21273410416 has 20 divisors (see below), whose sum is σ = 41518092672. Its totient is φ = 10559063936.

The previous prime is 21273410407. The next prime is 21273410437. The reversal of 21273410416 is 61401437212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4850320 + ... + 4854703.

Almost surely, 2^21273410416 is an apocalyptic number.

It is an amenable number.

21273410416 is a deficient number, since it is larger than the sum of its proper divisors (20244682256).

21273410416 is a wasteful number, since it uses less digits than its factorization.

21273410416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9705168 (or 9705162 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 21273410416 its reverse (61401437212), we get a palindrome (82674847628).

The spelling of 21273410416 in words is "twenty-one billion, two hundred seventy-three million, four hundred ten thousand, four hundred sixteen".