2152621 has 2 divisors, whose sum is σ = 2152622. Its totient is φ = 2152620.

The previous prime is 2152607. The next prime is 2152637. The reversal of 2152621 is 1262512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1590121 + 562500 = 1261^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152621 - 2⁵ = 2152589 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2152691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076310 + 1076311.

It is an arithmetic number, because the mean of its divisors is an integer number (1076311).

2^2152621 is an apocalyptic number.

It is an amenable number.

2152621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2152621 is an equidigital number, since it uses as much as digits as its factorization.

2152621 is an evil number, because the sum of its binary digits is even.

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

The square root of 2152621 is about 1467.1813112223. The cubic root of 2152621 is about 129.1187137063.

The spelling of 2152621 in words is "two million, one hundred fifty-two thousand, six hundred twenty-one".