21437041 has 2 divisors, whose sum is σ = 21437042. Its totient is φ = 21437040.

The previous prime is 21437021. The next prime is 21437063. The reversal of 21437041 is 14073412.

It is an a-pointer prime, because the next prime (21437063) can be obtained adding 21437041 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 9740641 = 3420^2 + 3121^2 .

It is a cyclic number.

It is not a de Polignac number, because 21437041 - 2¹⁹ = 20912753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21437011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10718520 + 10718521.

It is an arithmetic number, because the mean of its divisors is an integer number (10718521).

Almost surely, 2^21437041 is an apocalyptic number.

It is an amenable number.

21437041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21437041 is an equidigital number, since it uses as much as digits as its factorization.

21437041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21437041 is about 4630.0152267568. The cubic root of 21437041 is about 277.7932014488.

The spelling of 21437041 in words is "twenty-one million, four hundred thirty-seven thousand, forty-one".