21024213 has 8 divisors (see below), whose sum is σ = 32036928. Its totient is φ = 12013824.

The previous prime is 21024209. The next prime is 21024221. The reversal of 21024213 is 31242012.

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

It is not a de Polignac number, because 21024213 - 2² = 21024209 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21024192 and 21024201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024253) 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, 500556 + ... + 500597.

It is an arithmetic number, because the mean of its divisors is an integer number (4004616).

Almost surely, 2^21024213 is an apocalyptic number.

It is an amenable number.

21024213 is a deficient number, since it is larger than the sum of its proper divisors (11012715).

21024213 is a wasteful number, since it uses less digits than its factorization.

21024213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001163.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21024213 is about 4585.2167887680. The cubic root of 21024213 is about 275.9984115641.

Adding to 21024213 its reverse (31242012), we get a palindrome (52266225).

The spelling of 21024213 in words is "twenty-one million, twenty-four thousand, two hundred thirteen".