21724111470 has 64 divisors (see below), whose sum is σ = 55226131776. Its totient is φ = 5450219520.

The previous prime is 21724111463. The next prime is 21724111523. The reversal of 21724111470 is 7411142712.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1634050 + ... + 1647290.

It is an arithmetic number, because the mean of its divisors is an integer number (862908309).

Almost surely, 2^21724111470 is an apocalyptic number.

21724111470 is an abundant number, since it is smaller than the sum of its proper divisors (33502020306).

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

21724111470 is a wasteful number, since it uses less digits than its factorization.

21724111470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16485.

The product of its (nonzero) digits is 3136, while the sum is 30.

The spelling of 21724111470 in words is "twenty-one billion, seven hundred twenty-four million, one hundred eleven thousand, four hundred seventy".