21054941 has 2 divisors, whose sum is σ = 21054942. Its totient is φ = 21054940.

The previous prime is 21054923. The next prime is 21054953. The reversal of 21054941 is 14945012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20748025 + 306916 = 4555^2 + 554^2 .

It is a cyclic number.

It is not a de Polignac number, because 21054941 - 2¹⁴ = 21038557 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21054941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21054541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527470 + 10527471.

It is an arithmetic number, because the mean of its divisors is an integer number (10527471).

Almost surely, 2^21054941 is an apocalyptic number.

It is an amenable number.

21054941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054941 is an equidigital number, since it uses as much as digits as its factorization.

21054941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 21054941 is about 4588.5663338346. The cubic root of 21054941 is about 276.1328082046.

Adding to 21054941 its reverse (14945012), we get a palindrome (35999953).

The spelling of 21054941 in words is "twenty-one million, fifty-four thousand, nine hundred forty-one".