21543264546 has 8 divisors (see below), whose sum is σ = 43086529104. Its totient is φ = 7181088180.

The previous prime is 21543264503. The next prime is 21543264553. The reversal of 21543264546 is 64546234512.

It is a happy number.

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

21543264546 is an admirable number.

It is a super-2 number, since 2×21543264546² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21543264498 and 21543264507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1795272040 + ... + 1795272051.

It is an arithmetic number, because the mean of its divisors is an integer number (5385816138).

Almost surely, 2^21543264546 is an apocalyptic number.

21543264546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21543264546 is a wasteful number, since it uses less digits than its factorization.

21543264546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590544096.

The product of its digits is 691200, while the sum is 42.

The spelling of 21543264546 in words is "twenty-one billion, five hundred forty-three million, two hundred sixty-four thousand, five hundred forty-six".