2153621 has 2 divisors, whose sum is σ = 2153622. Its totient is φ = 2153620.

The previous prime is 2153563. The next prime is 2153633. The reversal of 2153621 is 1263512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 7396 = 1465^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153621 - 2¹⁴ = 2137237 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2153593 and 2153602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2153321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076810 + 1076811.

It is an arithmetic number, because the mean of its divisors is an integer number (1076811).

2^2153621 is an apocalyptic number.

It is an amenable number.

2153621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153621 is an equidigital number, since it uses as much as digits as its factorization.

2153621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 20.

The square root of 2153621 is about 1467.5220611630. The cubic root of 2153621 is about 129.1387046421.

The spelling of 2153621 in words is "two million, one hundred fifty-three thousand, six hundred twenty-one".