21117740616 has 48 divisors (see below), whose sum is σ = 65364436800. Its totient is φ = 6033640032.

The previous prime is 21117740599. The next prime is 21117740689. The reversal of 21117740616 is 61604771112.

21117740616 is a `hidden beast` number, since 21 + 1 + 17 + 7 + 4 + 0 + 616 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 20949636 + ... + 20950643.

It is an arithmetic number, because the mean of its divisors is an integer number (1361759100).

Almost surely, 2^21117740616 is an apocalyptic number.

It is an amenable number.

21117740616 is an abundant number, since it is smaller than the sum of its proper divisors (44246696184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21117740616 is a wasteful number, since it uses less digits than its factorization.

21117740616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41900298 (or 41900291 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The spelling of 21117740616 in words is "twenty-one billion, one hundred seventeen million, seven hundred forty thousand, six hundred sixteen".