21055141 has 2 divisors, whose sum is σ = 21055142. Its totient is φ = 21055140.

The previous prime is 21055123. The next prime is 21055147. The reversal of 21055141 is 14155012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19766916 + 1288225 = 4446^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 21055141 - 2¹¹ = 21053093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21055147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527570 + 10527571.

It is an arithmetic number, because the mean of its divisors is an integer number (10527571).

Almost surely, 2^21055141 is an apocalyptic number.

It is an amenable number.

21055141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21055141 is an equidigital number, since it uses as much as digits as its factorization.

21055141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 21055141 is about 4588.5881270822. The cubic root of 21055141 is about 276.1336825265.

The spelling of 21055141 in words is "twenty-one million, fifty-five thousand, one hundred forty-one".