20232471721 has 8 divisors (see below), whose sum is σ = 25224899904. Its totient is φ = 15765562320.

The previous prime is 20232471641. The next prime is 20232471793. The reversal of 20232471721 is 12717423202.

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 20232471721 - 2¹⁷ = 20232340649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20232471421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131379610 + ... + 131379763.

It is an arithmetic number, because the mean of its divisors is an integer number (3153112488).

Almost surely, 2^20232471721 is an apocalyptic number.

It is an amenable number.

20232471721 is a deficient number, since it is larger than the sum of its proper divisors (4992428183).

20232471721 is a wasteful number, since it uses less digits than its factorization.

20232471721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262759391.

The product of its (nonzero) digits is 9408, while the sum is 31.

Adding to 20232471721 its reverse (12717423202), we get a palindrome (32949894923).

The spelling of 20232471721 in words is "twenty billion, two hundred thirty-two million, four hundred seventy-one thousand, seven hundred twenty-one".