21116323504 has 20 divisors (see below), whose sum is σ = 40918981464. Its totient is φ = 10556586368.

The previous prime is 21116323489. The next prime is 21116323519. The reversal of 21116323504 is 40532361112.

It is an interprime number because it is at equal distance from previous prime (21116323489) and next prime (21116323519).

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, 16164 + ... + 206140.

Almost surely, 2^21116323504 is an apocalyptic number.

It is an amenable number.

21116323504 is a deficient number, since it is larger than the sum of its proper divisors (19802657960).

21116323504 is a wasteful number, since it uses less digits than its factorization.

21116323504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196932 (or 196926 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 21116323504 its reverse (40532361112), we get a palindrome (61648684616).

The spelling of 21116323504 in words is "twenty-one billion, one hundred sixteen million, three hundred twenty-three thousand, five hundred four".