21464406643 has 8 divisors (see below), whose sum is σ = 21498309056. Its totient is φ = 21430526400.

The previous prime is 21464406631. The next prime is 21464406673. The reversal of 21464406643 is 34660446412.

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 21464406643 - 2²⁵ = 21430852211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21464406596 and 21464406605.

It is not an unprimeable number, because it can be changed into a prime (21464406673) 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, 3503623 + ... + 3509743.

It is an arithmetic number, because the mean of its divisors is an integer number (2687288632).

Almost surely, 2^21464406643 is an apocalyptic number.

21464406643 is a deficient number, since it is larger than the sum of its proper divisors (33902413).

21464406643 is an equidigital number, since it uses as much as digits as its factorization.

21464406643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11085.

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 21464406643 in words is "twenty-one billion, four hundred sixty-four million, four hundred six thousand, six hundred forty-three".