21360841 has 2 divisors, whose sum is σ = 21360842. Its totient is φ = 21360840.

The previous prime is 21360827. The next prime is 21360851. The reversal of 21360841 is 14806312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21196816 + 164025 = 4604^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 21360841 - 2¹³ = 21352649 is a prime.

It is not a weakly prime, because it can be changed into another prime (21360811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10680420 + 10680421.

It is an arithmetic number, because the mean of its divisors is an integer number (10680421).

Almost surely, 2^21360841 is an apocalyptic number.

It is an amenable number.

21360841 is a deficient number, since it is larger than the sum of its proper divisors (1).

21360841 is an equidigital number, since it uses as much as digits as its factorization.

21360841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21360841 is about 4621.7789864943. The cubic root of 21360841 is about 277.4636632345.

It can be divided in two parts, 21360 and 841, that added together give a square (22201 = 149²).

The spelling of 21360841 in words is "twenty-one million, three hundred sixty thousand, eight hundred forty-one".