4123621 has 2 divisors, whose sum is σ = 4123622. Its totient is φ = 4123620.

The previous prime is 4123591. The next prime is 4123633. The reversal of 4123621 is 1263214.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4040100 + 83521 = 2010^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 4123621 - 2¹¹ = 4121573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4123681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2061810 + 2061811.

It is an arithmetic number, because the mean of its divisors is an integer number (2061811).

Almost surely, 2^4123621 is an apocalyptic number.

It is an amenable number.

4123621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4123621 is an equidigital number, since it uses as much as digits as its factorization.

4123621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 4123621 is about 2030.6700864493. The cubic root of 4123621 is about 160.3588430338.

Adding to 4123621 its reverse (1263214), we get a palindrome (5386835).

The spelling of 4123621 in words is "four million, one hundred twenty-three thousand, six hundred twenty-one".