21724713667450 has 48 divisors (see below), whose sum is σ = 42220537176960. Its totient is φ = 8301083757120.

The previous prime is 21724713667351. The next prime is 21724713667463. The reversal of 21724713667450 is 5476631742712.

It is a junction number, because it is equal to n+sod(n) for n = 21724713667391 and 21724713667400.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11607030 + ... + 13348129.

It is an arithmetic number, because the mean of its divisors is an integer number (879594524520).

Almost surely, 2^{21724713667450} is an apocalyptic number.

21724713667450 is a deficient number, since it is larger than the sum of its proper divisors (20495823509510).

21724713667450 is a wasteful number, since it uses less digits than its factorization.

21724713667450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24955951 (or 24955946 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 55.

The spelling of 21724713667450 in words is "twenty-one trillion, seven hundred twenty-four billion, seven hundred thirteen million, six hundred sixty-seven thousand, four hundred fifty".