21624644642612 has 12 divisors (see below), whose sum is σ = 41283412499616. Its totient is φ = 9829383928440.

The previous prime is 21624644642569. The next prime is 21624644642621.

It is a happy number.

21624644642612 is nontrivially palindromic in base 10.

It is a congruent number.

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, 245734598168 + ... + 245734598255.

It is an arithmetic number, because the mean of its divisors is an integer number (3440284374968).

Almost surely, 2^{21624644642612} is an apocalyptic number.

21624644642612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21624644642612 is a deficient number, since it is larger than the sum of its proper divisors (19658767857004).

21624644642612 is a wasteful number, since it uses less digits than its factorization.

21624644642612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491469196438 (or 491469196436 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 50.

The spelling of 21624644642612 in words is "twenty-one trillion, six hundred twenty-four billion, six hundred forty-four million, six hundred forty-two thousand, six hundred twelve".