21222221212313 has 6 divisors (see below), whose sum is σ = 23326904307882. Its totient is φ = 19292928374720.

The previous prime is 21222221212267. The next prime is 21222221212319. The reversal of 21222221212313 is 31321212222212.

It can be written as a sum of positive squares in only one way, i.e., 20607577756249 + 614643456064 = 4539557^2 + 783992^2 .

It is not a de Polignac number, because 21222221212313 - 2⁴⁴ = 3630035167897 is a prime.

It is a super-3 number, since 3×21222221212313³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222221212319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87695128856 + ... + 87695129097.

It is an arithmetic number, because the mean of its divisors is an integer number (3887817384647).

Almost surely, 2^{21222221212313} is an apocalyptic number.

It is an amenable number.

21222221212313 is a deficient number, since it is larger than the sum of its proper divisors (2104683095569).

21222221212313 is a wasteful number, since it uses less digits than its factorization.

21222221212313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175390257975 (or 175390257964 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

Adding to 21222221212313 its reverse (31321212222212), we get a palindrome (52543433434525).

The spelling of 21222221212313 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, three hundred thirteen".