21742695 has 48 divisors (see below), whose sum is σ = 41899680. Its totient is φ = 10692864.

The previous prime is 21742691. The next prime is 21742697. The reversal of 21742695 is 59624712.

It is not a de Polignac number, because 21742695 - 2² = 21742691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21742691) 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 47 ways as a sum of consecutive naturals, for example, 22339 + ... + 23291.

It is an arithmetic number, because the mean of its divisors is an integer number (872910).

Almost surely, 2^21742695 is an apocalyptic number.

21742695 is a deficient number, since it is larger than the sum of its proper divisors (20156985).

21742695 is a wasteful number, since it uses less digits than its factorization.

21742695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993 (or 974 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 21742695 is about 4662.9062825667. The cubic root of 21742695 is about 279.1072544046.

The spelling of 21742695 in words is "twenty-one million, seven hundred forty-two thousand, six hundred ninety-five".