21865749485 has 8 divisors (see below), whose sum is σ = 26239796856. Its totient is φ = 17492001280.

The previous prime is 21865749463. The next prime is 21865749497. The reversal of 21865749485 is 58494756812.

It can be written as a sum of positive squares in 4 ways, for example, as 11960921956 + 9904827529 = 109366^2 + 99523^2 .

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

It is not a de Polignac number, because 21865749485 - 2⁶ = 21865749421 is a prime.

It is a super-2 number, since 2×21865749485² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144425 + ... + 254145.

It is an arithmetic number, because the mean of its divisors is an integer number (3279974607).

Almost surely, 2^21865749485 is an apocalyptic number.

It is an amenable number.

21865749485 is a deficient number, since it is larger than the sum of its proper divisors (4374047371).

21865749485 is a wasteful number, since it uses less digits than its factorization.

21865749485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149583.

The product of its digits is 19353600, while the sum is 59.

The spelling of 21865749485 in words is "twenty-one billion, eight hundred sixty-five million, seven hundred forty-nine thousand, four hundred eighty-five".