21492941 has 2 divisors, whose sum is σ = 21492942. Its totient is φ = 21492940.

The previous prime is 21492937. The next prime is 21492949. The reversal of 21492941 is 14929412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 1876900 = 4429^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 21492941 - 2² = 21492937 is a prime.

It is a Chen prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 21492898 and 21492907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21492949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10746470 + 10746471.

It is an arithmetic number, because the mean of its divisors is an integer number (10746471).

Almost surely, 2^21492941 is an apocalyptic number.

It is an amenable number.

21492941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21492941 is an equidigital number, since it uses as much as digits as its factorization.

21492941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 21492941 is about 4636.0479937119. The cubic root of 21492941 is about 278.0344530562.

The spelling of 21492941 in words is "twenty-one million, four hundred ninety-two thousand, nine hundred forty-one".