21875041 has 2 divisors, whose sum is σ = 21875042. Its totient is φ = 21875040.

The previous prime is 21875033. The next prime is 21875071. The reversal of 21875041 is 14057812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21390625 + 484416 = 4625^2 + 696^2 .

It is a cyclic number.

It is not a de Polignac number, because 21875041 - 2³ = 21875033 is a prime.

It is equal to p_1381825 and since 21875041 and 1381825 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21875071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10937520 + 10937521.

It is an arithmetic number, because the mean of its divisors is an integer number (10937521).

Almost surely, 2^21875041 is an apocalyptic number.

It is an amenable number.

21875041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21875041 is an equidigital number, since it uses as much as digits as its factorization.

21875041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 21875041 is about 4677.0761165497. The cubic root of 21875041 is about 279.6724102488.

It can be divided in two parts, 218750 and 41, that added together give a triangular number (218791 = T₆₆₁).

The spelling of 21875041 in words is "twenty-one million, eight hundred seventy-five thousand, forty-one".