21650683 has 2 divisors, whose sum is σ = 21650684. Its totient is φ = 21650682.

The previous prime is 21650653. The next prime is 21650689. The reversal of 21650683 is 38605612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21650683 is a prime.

It is not a weakly prime, because it can be changed into another prime (21650689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10825341 + 10825342.

It is an arithmetic number, because the mean of its divisors is an integer number (10825342).

Almost surely, 2^21650683 is an apocalyptic number.

21650683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21650683 is an equidigital number, since it uses as much as digits as its factorization.

21650683 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 21650683 is about 4653.0294432767. The cubic root of 21650683 is about 278.7129836158.

The spelling of 21650683 in words is "twenty-one million, six hundred fifty thousand, six hundred eighty-three".