21740341 has 4 divisors (see below), whose sum is σ = 24846112. Its totient is φ = 18634572.

The previous prime is 21740317. The next prime is 21740347. The reversal of 21740341 is 14304712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21740341 - 2⁵ = 21740309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21740347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1552875 + ... + 1552888.

It is an arithmetic number, because the mean of its divisors is an integer number (6211528).

Almost surely, 2^21740341 is an apocalyptic number.

It is an amenable number.

21740341 is a deficient number, since it is larger than the sum of its proper divisors (3105771).

21740341 is an equidigital number, since it uses as much as digits as its factorization.

21740341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105770.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21740341 is about 4662.6538580512. The cubic root of 21740341 is about 279.0971814094.

The spelling of 21740341 in words is "twenty-one million, seven hundred forty thousand, three hundred forty-one".