21731064545 has 8 divisors (see below), whose sum is σ = 26233429824. Its totient is φ = 17280750064.

The previous prime is 21731064529. The next prime is 21731064577. The reversal of 21731064545 is 54546013712.

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

It is a cyclic number.

It is not a de Polignac number, because 21731064545 - 2⁴ = 21731064529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21731064499 and 21731064508.

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, 13011779 + ... + 13013448.

It is an arithmetic number, because the mean of its divisors is an integer number (3279178728).

Almost surely, 2^21731064545 is an apocalyptic number.

It is an amenable number.

21731064545 is a deficient number, since it is larger than the sum of its proper divisors (4502365279).

21731064545 is a wasteful number, since it uses less digits than its factorization.

21731064545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26025399.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 21731064545 in words is "twenty-one billion, seven hundred thirty-one million, sixty-four thousand, five hundred forty-five".