21640411463 has 8 divisors (see below), whose sum is σ = 23645867520. Its totient is φ = 19641313080.

The previous prime is 21640411439. The next prime is 21640411483. The reversal of 21640411463 is 36411404612.

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 21640411463 - 2¹⁶ = 21640345927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21640411483) 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, 1582295 + ... + 1595912.

It is an arithmetic number, because the mean of its divisors is an integer number (2955733440).

Almost surely, 2^21640411463 is an apocalyptic number.

21640411463 is a deficient number, since it is larger than the sum of its proper divisors (2005456057).

21640411463 is a wasteful number, since it uses less digits than its factorization.

21640411463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3178837.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 21640411463 in words is "twenty-one billion, six hundred forty million, four hundred eleven thousand, four hundred sixty-three".