3706432123621 has 4 divisors (see below), whose sum is σ = 3706447289644. Its totient is φ = 3706416957600.

The previous prime is 3706432123573. The next prime is 3706432123837. The reversal of 3706432123621 is 1263212346073.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 830996328100 + 2875435795521 = 911590^2 + 1695711^2 .

It is a cyclic number.

It is not a de Polignac number, because 3706432123621 - 2²⁵ = 3706398569189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3706432123021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7210320 + ... + 7707241.

It is an arithmetic number, because the mean of its divisors is an integer number (926611822411).

Almost surely, 2^{3706432123621} is an apocalyptic number.

It is an amenable number.

3706432123621 is a deficient number, since it is larger than the sum of its proper divisors (15166023).

3706432123621 is a wasteful number, since it uses less digits than its factorization.

3706432123621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15166022.

The product of its (nonzero) digits is 217728, while the sum is 40.

Adding to 3706432123621 its reverse (1263212346073), we get a palindrome (4969644469694).

The spelling of 3706432123621 in words is "three trillion, seven hundred six billion, four hundred thirty-two million, one hundred twenty-three thousand, six hundred twenty-one".