21346361 has 4 divisors (see below), whose sum is σ = 21842832. Its totient is φ = 20849892.

The previous prime is 21346357. The next prime is 21346387. The reversal of 21346361 is 16364312.

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 21346361 - 2² = 21346357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21346361.

It is not an unprimeable number, because it can be changed into a prime (21346301) 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, 248171 + ... + 248256.

It is an arithmetic number, because the mean of its divisors is an integer number (5460708).

Almost surely, 2^21346361 is an apocalyptic number.

It is an amenable number.

21346361 is a deficient number, since it is larger than the sum of its proper divisors (496471).

21346361 is an equidigital number, since it uses as much as digits as its factorization.

21346361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496470.

The product of its digits is 2592, while the sum is 26.

The square root of 21346361 is about 4620.2122245629. The cubic root of 21346361 is about 277.4009537495.

The spelling of 21346361 in words is "twenty-one million, three hundred forty-six thousand, three hundred sixty-one".