21234175745 has 8 divisors (see below), whose sum is σ = 25614420480. Its totient is φ = 16898400880.

The previous prime is 21234175723. The next prime is 21234175757. The reversal of 21234175745 is 54757143212.

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

It is not a de Polignac number, because 21234175745 - 2¹⁸ = 21233913601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11116415 + ... + 11118324.

It is an arithmetic number, because the mean of its divisors is an integer number (3201802560).

Almost surely, 2^21234175745 is an apocalyptic number.

It is an amenable number.

21234175745 is a deficient number, since it is larger than the sum of its proper divisors (4380244735).

21234175745 is a wasteful number, since it uses less digits than its factorization.

21234175745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22234935.

The product of its digits is 235200, while the sum is 41.

The spelling of 21234175745 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-five thousand, seven hundred forty-five".