3531235637721 has 48 divisors (see below), whose sum is σ = 5414278673664. Its totient is φ = 2043519456000.

The previous prime is 3531235637719. The next prime is 3531235637759. The reversal of 3531235637721 is 1277365321353.

It is a happy number.

It is not a de Polignac number, because 3531235637721 - 2¹ = 3531235637719 is a prime.

It is a super-2 number, since 2×3531235637721² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3531235637711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1824610 + ... + 3223611.

It is an arithmetic number, because the mean of its divisors is an integer number (112797472368).

Almost surely, 2^{3531235637721} is an apocalyptic number.

It is an amenable number.

3531235637721 is a deficient number, since it is larger than the sum of its proper divisors (1883043035943).

3531235637721 is a wasteful number, since it uses less digits than its factorization.

3531235637721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5048334 (or 5048323 counting only the distinct ones).

The product of its digits is 2381400, while the sum is 48.

The spelling of 3531235637721 in words is "three trillion, five hundred thirty-one billion, two hundred thirty-five million, six hundred thirty-seven thousand, seven hundred twenty-one".