21248113 has 16 divisors (see below), whose sum is σ = 24247296. Its totient is φ = 18501120.

The previous prime is 21248107. The next prime is 21248119. The reversal of 21248113 is 31184212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21248107) and next prime (21248119).

It is a cyclic number.

It is not a de Polignac number, because 21248113 - 2⁵ = 21248081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21248119) 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, 11245 + ... + 12997.

It is an arithmetic number, because the mean of its divisors is an integer number (1515456).

Almost surely, 2^21248113 is an apocalyptic number.

21248113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21248113 is a deficient number, since it is larger than the sum of its proper divisors (2999183).

21248113 is a wasteful number, since it uses less digits than its factorization.

21248113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824.

The product of its digits is 384, while the sum is 22.

The square root of 21248113 is about 4609.5675502155. The cubic root of 21248113 is about 276.9747139008.

The spelling of 21248113 in words is "twenty-one million, two hundred forty-eight thousand, one hundred thirteen".