3502072391021 has 16 divisors (see below), whose sum is σ = 3628408679280. Its totient is φ = 3377697607680.

The previous prime is 3502072391003. The next prime is 3502072391029. The reversal of 3502072391021 is 1201932702053.

It can be written as a sum of positive squares in 8 ways, for example, as 758789077225 + 2743283313796 = 871085^2 + 1656286^2 .

It is not a de Polignac number, because 3502072391021 - 2²² = 3502068196717 is a prime.

It is a super-4 number, since 4×3502072391021⁴ (a number of 51 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3502072391029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22447541 + ... + 22603013.

It is an arithmetic number, because the mean of its divisors is an integer number (226775542455).

Almost surely, 2^{3502072391021} is an apocalyptic number.

It is an amenable number.

3502072391021 is a deficient number, since it is larger than the sum of its proper divisors (126336288259).

3502072391021 is a wasteful number, since it uses less digits than its factorization.

3502072391021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161776.

The product of its (nonzero) digits is 22680, while the sum is 35.

The spelling of 3502072391021 in words is "three trillion, five hundred two billion, seventy-two million, three hundred ninety-one thousand, twenty-one".