21141751 has 2 divisors, whose sum is σ = 21141752. Its totient is φ = 21141750.

The previous prime is 21141733. The next prime is 21141779. The reversal of 21141751 is 15714112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21141751 - 2¹³ = 21133559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21141451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570875 + 10570876.

It is an arithmetic number, because the mean of its divisors is an integer number (10570876).

Almost surely, 2^21141751 is an apocalyptic number.

21141751 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141751 is an equidigital number, since it uses as much as digits as its factorization.

21141751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 280, while the sum is 22.

The square root of 21141751 is about 4598.0159851832. The cubic root of 21141751 is about 276.5117884463.

Adding to 21141751 its reverse (15714112), we get a palindrome (36855863).

The spelling of 21141751 in words is "twenty-one million, one hundred forty-one thousand, seven hundred fifty-one".