13823475721 has 6 divisors (see below), whose sum is σ = 15194399066. Its totient is φ = 12566796000.

The previous prime is 13823475719. The next prime is 13823475739. The reversal of 13823475721 is 12757432831.

It can be written as a sum of positive squares in only one way, i.e., 9051429321 + 4772046400 = 95139^2 + 69080^2 .

It is not a de Polignac number, because 13823475721 - 2¹ = 13823475719 is a prime.

It is a super-3 number, since 3×13823475721³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (13823475751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57121680 + ... + 57121921.

Almost surely, 2^13823475721 is an apocalyptic number.

13823475721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13823475721 is a deficient number, since it is larger than the sum of its proper divisors (1370923345).

13823475721 is a wasteful number, since it uses less digits than its factorization.

13823475721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114243623 (or 114243612 counting only the distinct ones).

The product of its digits is 282240, while the sum is 43.

The spelling of 13823475721 in words is "thirteen billion, eight hundred twenty-three million, four hundred seventy-five thousand, seven hundred twenty-one".