21548700685 has 8 divisors (see below), whose sum is σ = 26296719840. Its totient is φ = 16946774544.

The previous prime is 21548700673. The next prime is 21548700697. The reversal of 21548700685 is 58600784512.

It is an interprime number because it is at equal distance from previous prime (21548700673) and next prime (21548700697).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21548700685 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36522927 + ... + 36523516.

It is an arithmetic number, because the mean of its divisors is an integer number (3287089980).

Almost surely, 2^21548700685 is an apocalyptic number.

It is an amenable number.

21548700685 is a deficient number, since it is larger than the sum of its proper divisors (4748019155).

21548700685 is an equidigital number, since it uses as much as digits as its factorization.

21548700685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73046507.

The product of its (nonzero) digits is 537600, while the sum is 46.

The spelling of 21548700685 in words is "twenty-one billion, five hundred forty-eight million, seven hundred thousand, six hundred eighty-five".