21207675202644 has 192 divisors, whose sum is σ = 59103841370112. Its totient is φ = 5791030502400.

The previous prime is 21207675202627. The next prime is 21207675202669. The reversal of 21207675202644 is 44620257670212.

It is a junction number, because it is equal to n+sod(n) for n = 21207675202593 and 21207675202602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 618336504 + ... + 618370800.

It is an arithmetic number, because the mean of its divisors is an integer number (307832507136).

Almost surely, 2^{21207675202644} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21207675202644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29551920685056).

21207675202644 is an abundant number, since it is smaller than the sum of its proper divisors (37896166167468).

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

21207675202644 is a wasteful number, since it uses less digits than its factorization.

21207675202644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37286 (or 37284 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 48.

The spelling of 21207675202644 in words is "twenty-one trillion, two hundred seven billion, six hundred seventy-five million, two hundred two thousand, six hundred forty-four".