3646372232021 has 2 divisors, whose sum is σ = 3646372232022. Its totient is φ = 3646372232020.

The previous prime is 3646372232003. The next prime is 3646372232023. The reversal of 3646372232021 is 1202322736463.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3480515596996 + 165856635025 = 1865614^2 + 407255^2 .

It is an emirp because it is prime and its reverse (1202322736463) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3646372232021 - 2²⁶ = 3646305123157 is a prime.

Together with 3646372232023, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3646372232021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3646372232023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1823186116010 + 1823186116011.

It is an arithmetic number, because the mean of its divisors is an integer number (1823186116011).

Almost surely, 2^{3646372232021} is an apocalyptic number.

It is an amenable number.

3646372232021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3646372232021 is an equidigital number, since it uses as much as digits as its factorization.

3646372232021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 41.

Adding to 3646372232021 its reverse (1202322736463), we get a palindrome (4848694968484).

The spelling of 3646372232021 in words is "three trillion, six hundred forty-six billion, three hundred seventy-two million, two hundred thirty-two thousand, twenty-one".