21746918489 has 32 divisors (see below), whose sum is σ = 23138438400. Its totient is φ = 20409338880.

The previous prime is 21746918467. The next prime is 21746918507. The reversal of 21746918489 is 98481964712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21746918489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21746918419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77391029 + ... + 77391309.

It is an arithmetic number, because the mean of its divisors is an integer number (723076200).

Almost surely, 2^21746918489 is an apocalyptic number.

21746918489 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21746918489 is a deficient number, since it is larger than the sum of its proper divisors (1391519911).

21746918489 is a wasteful number, since it uses less digits than its factorization.

21746918489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785.

The product of its digits is 6967296, while the sum is 59.

The spelling of 21746918489 in words is "twenty-one billion, seven hundred forty-six million, nine hundred eighteen thousand, four hundred eighty-nine".