21741983 has 2 divisors, whose sum is σ = 21741984. Its totient is φ = 21741982.

The previous prime is 21741959. The next prime is 21741989. The reversal of 21741983 is 38914712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21741983 - 2¹² = 21737887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21741989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10870991 + 10870992.

It is an arithmetic number, because the mean of its divisors is an integer number (10870992).

Almost surely, 2^21741983 is an apocalyptic number.

21741983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21741983 is an equidigital number, since it uses as much as digits as its factorization.

21741983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 21741983 is about 4662.8299347070. The cubic root of 21741983 is about 279.1042077640.

The spelling of 21741983 in words is "twenty-one million, seven hundred forty-one thousand, nine hundred eighty-three".