21302113 has 12 divisors (see below), whose sum is σ = 25098240. Its totient is φ = 18024552.

The previous prime is 21302111. The next prime is 21302123. The reversal of 21302113 is 31120312.

It is not a de Polignac number, because 21302113 - 2¹ = 21302111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21302093 and 21302102.

It is not an unprimeable number, because it can be changed into a prime (21302111) 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, 1120 + ... + 6622.

It is an arithmetic number, because the mean of its divisors is an integer number (2091520).

Almost surely, 2^21302113 is an apocalyptic number.

It is an amenable number.

21302113 is a deficient number, since it is larger than the sum of its proper divisors (3796127).

21302113 is an equidigital number, since it uses as much as digits as its factorization.

21302113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5596 (or 5589 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21302113 is about 4615.4212158805. The cubic root of 21302113 is about 277.2091501248.

Adding to 21302113 its reverse (31120312), we get a palindrome (52422425).

The spelling of 21302113 in words is "twenty-one million, three hundred two thousand, one hundred thirteen".