21544032641 has 8 divisors (see below), whose sum is σ = 21615703200. Its totient is φ = 21472459360.

The previous prime is 21544032637. The next prime is 21544032649. The reversal of 21544032641 is 14623044512.

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 21544032641 - 2² = 21544032637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21544032598 and 21544032607.

It is not an unprimeable number, because it can be changed into a prime (21544032649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433565 + ... + 480693.

It is an arithmetic number, because the mean of its divisors is an integer number (2701962900).

Almost surely, 2^21544032641 is an apocalyptic number.

It is an amenable number.

21544032641 is a deficient number, since it is larger than the sum of its proper divisors (71670559).

21544032641 is a wasteful number, since it uses less digits than its factorization.

21544032641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48639.

The product of its (nonzero) digits is 23040, while the sum is 32.

The spelling of 21544032641 in words is "twenty-one billion, five hundred forty-four million, thirty-two thousand, six hundred forty-one".