21735542331 has 12 divisors (see below), whose sum is σ = 31428263152. Its totient is φ = 14475370896.

The previous prime is 21735542303. The next prime is 21735542351. The reversal of 21735542331 is 13324553712.

21735542331 is a `hidden beast` number, since 2 + 1 + 73 + 554 + 2 + 3 + 31 = 666.

It is not a de Polignac number, because 21735542331 - 2¹⁰ = 21735541307 is a prime.

It is a super-2 number, since 2×21735542331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21735542351) 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 11 ways as a sum of consecutive naturals, for example, 1240036 + ... + 1257441.

Almost surely, 2^21735542331 is an apocalyptic number.

21735542331 is a deficient number, since it is larger than the sum of its proper divisors (9692720821).

21735542331 is a wasteful number, since it uses less digits than its factorization.

21735542331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2498450 (or 2498447 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The spelling of 21735542331 in words is "twenty-one billion, seven hundred thirty-five million, five hundred forty-two thousand, three hundred thirty-one".