21386361 has 8 divisors (see below), whose sum is σ = 28859040. Its totient is φ = 14085632.

The previous prime is 21386359. The next prime is 21386399. The reversal of 21386361 is 16368312.

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 21386361 - 2¹ = 21386359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21386861) 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, 42696 + ... + 43193.

It is an arithmetic number, because the mean of its divisors is an integer number (3607380).

Almost surely, 2^21386361 is an apocalyptic number.

It is an amenable number.

21386361 is a deficient number, since it is larger than the sum of its proper divisors (7472679).

21386361 is an equidigital number, since it uses as much as digits as its factorization.

21386361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85975.

The product of its digits is 5184, while the sum is 30.

The square root of 21386361 is about 4624.5390040522. The cubic root of 21386361 is about 277.5741154196.

The spelling of 21386361 in words is "twenty-one million, three hundred eighty-six thousand, three hundred sixty-one".