21752238547 has 8 divisors (see below), whose sum is σ = 23755425120. Its totient is φ = 19796185920.

The previous prime is 21752238499. The next prime is 21752238581. The reversal of 21752238547 is 74583225712.

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

It is not a de Polignac number, because 21752238547 - 2⁷ = 21752238419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21752238497 and 21752238506.

It is not an unprimeable number, because it can be changed into a prime (21752238587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11782522 + ... + 11784367.

It is an arithmetic number, because the mean of its divisors is an integer number (2969428140).

Almost surely, 2^21752238547 is an apocalyptic number.

21752238547 is a deficient number, since it is larger than the sum of its proper divisors (2003186573).

21752238547 is a wasteful number, since it uses less digits than its factorization.

21752238547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23566973.

The product of its digits is 940800, while the sum is 46.

The spelling of 21752238547 in words is "twenty-one billion, seven hundred fifty-two million, two hundred thirty-eight thousand, five hundred forty-seven".