21347161 has 8 divisors (see below), whose sum is σ = 24091200. Its totient is φ = 18737040.

The previous prime is 21347149. The next prime is 21347177. The reversal of 21347161 is 16174312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21347161 - 2¹⁵ = 21314393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21347111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33141 + ... + 33778.

It is an arithmetic number, because the mean of its divisors is an integer number (3011400).

Almost surely, 2^21347161 is an apocalyptic number.

It is an amenable number.

21347161 is a deficient number, since it is larger than the sum of its proper divisors (2744039).

21347161 is a wasteful number, since it uses less digits than its factorization.

21347161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66959.

The product of its digits is 1008, while the sum is 25.

The square root of 21347161 is about 4620.2987998613. The cubic root of 21347161 is about 277.4044191019.

It can be divided in two parts, 213 and 47161, that added together give a palindrome (47374).

The spelling of 21347161 in words is "twenty-one million, three hundred forty-seven thousand, one hundred sixty-one".