21221021210213 has 8 divisors (see below), whose sum is σ = 23642762509440. Its totient is φ = 18881372836480.

The previous prime is 21221021210203. The next prime is 21221021210227. The reversal of 21221021210213 is 31201212012212.

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

It is not a de Polignac number, because 21221021210213 - 2⁴ = 21221021210197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221021210203) 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, 20523230828 + ... + 20523231861.

It is an arithmetic number, because the mean of its divisors is an integer number (2955345313680).

Almost surely, 2^{21221021210213} is an apocalyptic number.

It is an amenable number.

21221021210213 is a deficient number, since it is larger than the sum of its proper divisors (2421741299227).

21221021210213 is a wasteful number, since it uses less digits than its factorization.

21221021210213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41046462747.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21221021210213 its reverse (31201212012212), we get a palindrome (52422233222425).

The spelling of 21221021210213 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred ten thousand, two hundred thirteen".