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2145421 is a prime number
BaseRepresentation
bin1000001011110010001101
311000222222001
420023302031
51022123141
6113552301
724143605
oct10136215
94028861
102145421
111235983
12875691
135a16a5
143dbc05
152c5a31
hex20bc8d

2145421 has 2 divisors, whose sum is σ = 2145422. Its totient is φ = 2145420.

The previous prime is 2145401. The next prime is 2145433. The reversal of 2145421 is 1245412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1974025 + 171396 = 1405^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145421 - 25 = 2145389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072710 + 1072711.

It is an arithmetic number, because the mean of its divisors is an integer number (1072711).

22145421 is an apocalyptic number.

It is an amenable number.

2145421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145421 is an equidigital number, since it uses as much as digits as its factorization.

2145421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 19.

The square root of 2145421 is about 1464.7255715662. The cubic root of 2145421 is about 128.9745958828.

Subtracting from 2145421 its reverse (1245412), we obtain a palindrome (900009).

The spelling of 2145421 in words is "two million, one hundred forty-five thousand, four hundred twenty-one".