21742083 has 24 divisors (see below), whose sum is σ = 35446320. Its totient is φ = 12720960.

The previous prime is 21742043. The next prime is 21742087. The reversal of 21742083 is 38024712.

It is not a de Polignac number, because 21742083 - 2¹⁰ = 21741059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21742087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 916 + ... + 6657.

It is an arithmetic number, because the mean of its divisors is an integer number (1476930).

Almost surely, 2^21742083 is an apocalyptic number.

21742083 is a deficient number, since it is larger than the sum of its proper divisors (13704237).

21742083 is a wasteful number, since it uses less digits than its factorization.

21742083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7619 (or 7616 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 21742083 is about 4662.8406577965. The cubic root of 21742083 is about 279.1046356670.

Adding to 21742083 its reverse (38024712), we get a palindrome (59766795).

The spelling of 21742083 in words is "twenty-one million, seven hundred forty-two thousand, eighty-three".