21697703 has 2 divisors, whose sum is σ = 21697704. Its totient is φ = 21697702.

The previous prime is 21697681. The next prime is 21697721. The reversal of 21697703 is 30779612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21697703 - 2²² = 17503399 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21697003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10848851 + 10848852.

It is an arithmetic number, because the mean of its divisors is an integer number (10848852).

Almost surely, 2^21697703 is an apocalyptic number.

21697703 is a deficient number, since it is larger than the sum of its proper divisors (1).

21697703 is an equidigital number, since it uses as much as digits as its factorization.

21697703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 21697703 is about 4658.0793252155. The cubic root of 21697703 is about 278.9146032584.

The spelling of 21697703 in words is "twenty-one million, six hundred ninety-seven thousand, seven hundred three".