21610741 has 4 divisors (see below), whose sum is σ = 22070592. Its totient is φ = 21150892.

The previous prime is 21610691. The next prime is 21610753. The reversal of 21610741 is 14701612.

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 21610741 - 2¹¹ = 21608693 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21610781) 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, 229855 + ... + 229948.

It is an arithmetic number, because the mean of its divisors is an integer number (5517648).

Almost surely, 2^21610741 is an apocalyptic number.

It is an amenable number.

21610741 is a deficient number, since it is larger than the sum of its proper divisors (459851).

21610741 is an equidigital number, since it uses as much as digits as its factorization.

21610741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459850.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21610741 is about 4648.7354194447. The cubic root of 21610741 is about 278.5414846872.

The spelling of 21610741 in words is "twenty-one million, six hundred ten thousand, seven hundred forty-one".