411121621 has 4 divisors (see below), whose sum is σ = 411911244. Its totient is φ = 410332000.

The previous prime is 411121561. The next prime is 411121631. The reversal of 411121621 is 126121114.

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 192820996 + 218300625 = 13886^2 + 14775^2 .

It is a cyclic number.

It is not a de Polignac number, because 411121621 - 2¹³ = 411113429 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 (411121631) 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, 394030 + ... + 395071.

It is an arithmetic number, because the mean of its divisors is an integer number (102977811).

Almost surely, 2^411121621 is an apocalyptic number.

It is an amenable number.

411121621 is a deficient number, since it is larger than the sum of its proper divisors (789623).

411121621 is an equidigital number, since it uses as much as digits as its factorization.

411121621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789622.

The product of its digits is 96, while the sum is 19.

The square root of 411121621 is about 20276.1342716012. The cubic root of 411121621 is about 743.5727044288.

Adding to 411121621 its reverse (126121114), we get a palindrome (537242735).

The spelling of 411121621 in words is "four hundred eleven million, one hundred twenty-one thousand, six hundred twenty-one".