3500003700021 has 16 divisors (see below), whose sum is σ = 4698169764480. Its totient is φ = 2317624442880.

The previous prime is 3500003699993. The next prime is 3500003700043. The reversal of 3500003700021 is 1200073000053.

It is a happy number.

It is not a de Polignac number, because 3500003700021 - 2⁶ = 3500003699957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3500001700021) 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 15 ways as a sum of consecutive naturals, for example, 4344081 + ... + 5086358.

It is an arithmetic number, because the mean of its divisors is an integer number (293635610280).

Almost surely, 2^{3500003700021} is an apocalyptic number.

It is an amenable number.

3500003700021 is a deficient number, since it is larger than the sum of its proper divisors (1198166064459).

3500003700021 is a wasteful number, since it uses less digits than its factorization.

3500003700021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9431276.

The product of its (nonzero) digits is 630, while the sum is 21.

Adding to 3500003700021 its reverse (1200073000053), we get a palindrome (4700076700074).

It can be divided in two parts, 3500003 and 700021, that added together give a palindrome (4200024).

The spelling of 3500003700021 in words is "three trillion, five hundred billion, three million, seven hundred thousand, twenty-one".