21868404973 has 8 divisors (see below), whose sum is σ = 21926983680. Its totient is φ = 21809884320.

The previous prime is 21868404949. The next prime is 21868404979. The reversal of 21868404973 is 37940486812.

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-21868404973 is a prime.

It is a super-2 number, since 2×21868404973² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21868404973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868404979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800148 + ... + 827026.

It is an arithmetic number, because the mean of its divisors is an integer number (2740872960).

Almost surely, 2^21868404973 is an apocalyptic number.

It is an amenable number.

21868404973 is a deficient number, since it is larger than the sum of its proper divisors (58578707).

21868404973 is a wasteful number, since it uses less digits than its factorization.

21868404973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29027.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 21868404973 in words is "twenty-one billion, eight hundred sixty-eight million, four hundred four thousand, nine hundred seventy-three".