21361071 has 8 divisors (see below), whose sum is σ = 28529920. Its totient is φ = 14216472.

The previous prime is 21361063. The next prime is 21361079. The reversal of 21361071 is 17016312.

It is an interprime number because it is at equal distance from previous prime (21361063) and next prime (21361079).

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

It is not a de Polignac number, because 21361071 - 2³ = 21361063 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 (21361079) 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, 3895 + ... + 7608.

It is an arithmetic number, because the mean of its divisors is an integer number (3566240).

Almost surely, 2^21361071 is an apocalyptic number.

21361071 is a deficient number, since it is larger than the sum of its proper divisors (7168849).

21361071 is a wasteful number, since it uses less digits than its factorization.

21361071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12125.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 21361071 is about 4621.8038686210. The cubic root of 21361071 is about 277.4646590819.

Adding to 21361071 its reverse (17016312), we get a palindrome (38377383).

The spelling of 21361071 in words is "twenty-one million, three hundred sixty-one thousand, seventy-one".