21584126645 has 8 divisors (see below), whose sum is σ = 26339951520. Its totient is φ = 16974634960.

The previous prime is 21584126617. The next prime is 21584126657. The reversal of 21584126645 is 54662148512.

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

It is not a de Polignac number, because 21584126645 - 2¹⁸ = 21583864501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21584126596 and 21584126605.

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, 36582971 + ... + 36583560.

It is an arithmetic number, because the mean of its divisors is an integer number (3292493940).

Almost surely, 2^21584126645 is an apocalyptic number.

It is an amenable number.

21584126645 is a deficient number, since it is larger than the sum of its proper divisors (4755824875).

21584126645 is an equidigital number, since it uses as much as digits as its factorization.

21584126645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73166595.

The product of its digits is 460800, while the sum is 44.

The spelling of 21584126645 in words is "twenty-one billion, five hundred eighty-four million, one hundred twenty-six thousand, six hundred forty-five".