21361113 has 12 divisors (see below), whose sum is σ = 30897828. Its totient is φ = 14220960.

The previous prime is 21361097. The next prime is 21361121. The reversal of 21361113 is 31116312.

It can be written as a sum of positive squares in 2 ways, for example, as 15586704 + 5774409 = 3948^2 + 2403^2 .

It is not a de Polignac number, because 21361113 - 2⁴ = 21361097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21361133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8431 + ... + 10667.

It is an arithmetic number, because the mean of its divisors is an integer number (2574819).

Almost surely, 2^21361113 is an apocalyptic number.

It is an amenable number.

21361113 is a deficient number, since it is larger than the sum of its proper divisors (9536715).

21361113 is a wasteful number, since it uses less digits than its factorization.

21361113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304 (or 3301 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 21361113 is about 4621.8084122992. The cubic root of 21361113 is about 277.4648409315.

Adding to 21361113 its reverse (31116312), we get a palindrome (52477425).

It can be divided in two parts, 2136 and 1113, that added together give a square (3249 = 57²).

The spelling of 21361113 in words is "twenty-one million, three hundred sixty-one thousand, one hundred thirteen".