21710761 has 12 divisors (see below), whose sum is σ = 22674960. Its totient is φ = 20780240.

The previous prime is 21710753. The next prime is 21710783. The reversal of 21710761 is 16701712.

It is not a de Polignac number, because 21710761 - 2³ = 21710753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21710791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165666 + ... + 165796.

It is an arithmetic number, because the mean of its divisors is an integer number (1889580).

Almost surely, 2^21710761 is an apocalyptic number.

It is an amenable number.

21710761 is a deficient number, since it is larger than the sum of its proper divisors (964199).

21710761 is an equidigital number, since it uses as much as digits as its factorization.

21710761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 21710761 is about 4659.4807650638. The cubic root of 21710761 is about 278.9705436886.

The spelling of 21710761 in words is "twenty-one million, seven hundred ten thousand, seven hundred sixty-one".