2125621 has 2 divisors, whose sum is σ = 2125622. Its totient is φ = 2125620.

The previous prime is 2125603. The next prime is 2125649. The reversal of 2125621 is 1265212.

2125621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1782225 + 343396 = 1335^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 2125621 - 2¹³ = 2117429 is a prime.

It is a super-5 number, since 5×2125621⁵ (a number of 33 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2125601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062810 + 1062811.

It is an arithmetic number, because the mean of its divisors is an integer number (1062811).

2^2125621 is an apocalyptic number.

It is an amenable number.

2125621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2125621 is an equidigital number, since it uses as much as digits as its factorization.

2125621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 19.

The square root of 2125621 is about 1457.9509593947. The cubic root of 2125621 is about 128.5766019670.

The spelling of 2125621 in words is "two million, one hundred twenty-five thousand, six hundred twenty-one".