21457703 has 2 divisors, whose sum is σ = 21457704. Its totient is φ = 21457702.

The previous prime is 21457697. The next prime is 21457717. The reversal of 21457703 is 30775412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21457703 - 2⁴ = 21457687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21457603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10728851 + 10728852.

It is an arithmetic number, because the mean of its divisors is an integer number (10728852).

Almost surely, 2^21457703 is an apocalyptic number.

21457703 is a deficient number, since it is larger than the sum of its proper divisors (1).

21457703 is an equidigital number, since it uses as much as digits as its factorization.

21457703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 21457703 is about 4632.2459995125. The cubic root of 21457703 is about 277.8824227182.

The spelling of 21457703 in words is "twenty-one million, four hundred fifty-seven thousand, seven hundred three".