21130213 has 8 divisors (see below), whose sum is σ = 23240448. Its totient is φ = 19089264.

The previous prime is 21130111. The next prime is 21130231. The reversal of 21130213 is 31203112.

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

It is a cyclic number.

It is not a de Polignac number, because 21130213 - 2¹⁷ = 20999141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21130193 and 21130202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16681 + ... + 17902.

It is an arithmetic number, because the mean of its divisors is an integer number (2905056).

Almost surely, 2^21130213 is an apocalyptic number.

It is an amenable number.

21130213 is a deficient number, since it is larger than the sum of its proper divisors (2110235).

21130213 is a wasteful number, since it uses less digits than its factorization.

21130213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34643.

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

The square root of 21130213 is about 4596.7611423697. The cubic root of 21130213 is about 276.4614776722.

Adding to 21130213 its reverse (31203112), we get a palindrome (52333325).

The spelling of 21130213 in words is "twenty-one million, one hundred thirty thousand, two hundred thirteen".