21212210110031 has 8 divisors (see below), whose sum is σ = 21266490700560. Its totient is φ = 21157933788288.

The previous prime is 21212210109989. The next prime is 21212210110037. The reversal of 21212210110031 is 13001101221212.

It is a happy number.

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 21212210110031 - 2³⁰ = 21211136368207 is a prime.

It is a super-4 number, since 4×21212210110031⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212210109991 and 21212210110009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212210110037) 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, 9005255 + ... + 11113911.

It is an arithmetic number, because the mean of its divisors is an integer number (2658311337570).

Almost surely, 2^{21212210110031} is an apocalyptic number.

21212210110031 is a deficient number, since it is larger than the sum of its proper divisors (54280590529).

21212210110031 is a wasteful number, since it uses less digits than its factorization.

21212210110031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134393.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21212210110031 its reverse (13001101221212), we get a palindrome (34213311331243).

The spelling of 21212210110031 in words is "twenty-one trillion, two hundred twelve billion, two hundred ten million, one hundred ten thousand, thirty-one".