21742411 has 2 divisors, whose sum is σ = 21742412. Its totient is φ = 21742410.

The previous prime is 21742381. The next prime is 21742447. The reversal of 21742411 is 11424712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21742411 - 2⁵ = 21742379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21742451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10871205 + 10871206.

It is an arithmetic number, because the mean of its divisors is an integer number (10871206).

Almost surely, 2^21742411 is an apocalyptic number.

21742411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21742411 is an equidigital number, since it uses as much as digits as its factorization.

21742411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 448, while the sum is 22.

The square root of 21742411 is about 4662.8758293568. The cubic root of 21742411 is about 279.1060391795.

The spelling of 21742411 in words is "twenty-one million, seven hundred forty-two thousand, four hundred eleven".