21220213 has 8 divisors (see below), whose sum is σ = 25034240. Its totient is φ = 17601840.

The previous prime is 21220211. The next prime is 21220219. The reversal of 21220213 is 31202212.

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 21220213 - 2¹ = 21220211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21220193 and 21220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220211) 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, 48678 + ... + 49111.

It is an arithmetic number, because the mean of its divisors is an integer number (3129280).

Almost surely, 2^21220213 is an apocalyptic number.

It is an amenable number.

21220213 is a deficient number, since it is larger than the sum of its proper divisors (3814027).

21220213 is an equidigital number, since it uses as much as digits as its factorization.

21220213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97827.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21220213 is about 4606.5402418735. The cubic root of 21220213 is about 276.8534328684.

Adding to 21220213 its reverse (31202212), we get a palindrome (52422425).

The spelling of 21220213 in words is "twenty-one million, two hundred twenty thousand, two hundred thirteen".