21213121122213 has 8 divisors (see below), whose sum is σ = 28941932694048. Its totient is φ = 13813195149264.

The previous prime is 21213121122203. The next prime is 21213121122229. The reversal of 21213121122213 is 31222112131212.

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

It is not a de Polignac number, because 21213121122213 - 2¹⁴ = 21213121105829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213121122203) 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, 82221399570 + ... + 82221399827.

It is an arithmetic number, because the mean of its divisors is an integer number (3617741586756).

Almost surely, 2^{21213121122213} is an apocalyptic number.

It is an amenable number.

21213121122213 is a deficient number, since it is larger than the sum of its proper divisors (7728811571835).

21213121122213 is a wasteful number, since it uses less digits than its factorization.

21213121122213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164442799443.

The product of its digits is 576, while the sum is 24.

Adding to 21213121122213 its reverse (31222112131212), we get a palindrome (52435233253425).

The spelling of 21213121122213 in words is "twenty-one trillion, two hundred thirteen billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred thirteen".