21502113 has 8 divisors (see below), whose sum is σ = 28790400. Its totient is φ = 14274288.

The previous prime is 21502111. The next prime is 21502123. The reversal of 21502113 is 31120512.

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

It is not a de Polignac number, because 21502113 - 2¹ = 21502111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21502092 and 21502101.

It is not an unprimeable number, because it can be changed into a prime (21502111) 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, 14278 + ... + 15711.

It is an arithmetic number, because the mean of its divisors is an integer number (3598800).

Almost surely, 2^21502113 is an apocalyptic number.

It is an amenable number.

21502113 is a deficient number, since it is larger than the sum of its proper divisors (7288287).

21502113 is a wasteful number, since it uses less digits than its factorization.

21502113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30231.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 21502113 is about 4637.0370927997. The cubic root of 21502113 is about 278.0739973472.

Adding to 21502113 its reverse (31120512), we get a palindrome (52622625).

The spelling of 21502113 in words is "twenty-one million, five hundred two thousand, one hundred thirteen".