21232071571 has 8 divisors (see below), whose sum is σ = 21981290400. Its totient is φ = 20483991360.

The previous prime is 21232071533. The next prime is 21232071577. The reversal of 21232071571 is 17517023212.

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

It is a cyclic number.

It is not a de Polignac number, because 21232071571 - 2⁹ = 21232071059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232071577) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 246615 + ... + 321376.

It is an arithmetic number, because the mean of its divisors is an integer number (2747661300).

Almost surely, 2^21232071571 is an apocalyptic number.

21232071571 is a deficient number, since it is larger than the sum of its proper divisors (749218829).

21232071571 is a wasteful number, since it uses less digits than its factorization.

21232071571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569309.

The product of its (nonzero) digits is 5880, while the sum is 31.

Adding to 21232071571 its reverse (17517023212), we get a palindrome (38749094783).

The spelling of 21232071571 in words is "twenty-one billion, two hundred thirty-two million, seventy-one thousand, five hundred seventy-one".