21710603 has 2 divisors, whose sum is σ = 21710604. Its totient is φ = 21710602.

The previous prime is 21710573. The next prime is 21710609. The reversal of 21710603 is 30601712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21710603 - 2²² = 17516299 is a prime.

It is not a weakly prime, because it can be changed into another prime (21710609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10855301 + 10855302.

It is an arithmetic number, because the mean of its divisors is an integer number (10855302).

Almost surely, 2^21710603 is an apocalyptic number.

21710603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21710603 is an equidigital number, since it uses as much as digits as its factorization.

21710603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21710603 is about 4659.4638103541. The cubic root of 21710603 is about 278.9698669511.

The spelling of 21710603 in words is "twenty-one million, seven hundred ten thousand, six hundred three".