21342113 has 16 divisors (see below), whose sum is σ = 23647680. Its totient is φ = 19141056.

The previous prime is 21342071. The next prime is 21342119. The reversal of 21342113 is 31124312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21342113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21342091 and 21342100.

It is not an unprimeable number, because it can be changed into a prime (21342119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93083 + ... + 93311.

It is an arithmetic number, because the mean of its divisors is an integer number (1477980).

Almost surely, 2^21342113 is an apocalyptic number.

It is an amenable number.

21342113 is a deficient number, since it is larger than the sum of its proper divisors (2305567).

21342113 is a wasteful number, since it uses less digits than its factorization.

21342113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416.

The product of its digits is 144, while the sum is 17.

The square root of 21342113 is about 4619.7524825471. The cubic root of 21342113 is about 277.3825512775.

Adding to 21342113 its reverse (31124312), we get a palindrome (52466425).

The spelling of 21342113 in words is "twenty-one million, three hundred forty-two thousand, one hundred thirteen".