31212310110221 has 8 divisors (see below), whose sum is σ = 31309068261240. Its totient is φ = 31115621901312.

The previous prime is 31212310110217. The next prime is 31212310110257. The reversal of 31212310110221 is 12201101321213.

It can be written as a sum of positive squares in 4 ways, for example, as 1519946245321 + 29692363864900 = 1232861^2 + 5449070^2 .

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 31212310110221 - 2² = 31212310110217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212310110193 and 31212310110202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212310110721) 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, 16591556 + ... + 18376733.

It is an arithmetic number, because the mean of its divisors is an integer number (3913633532655).

Almost surely, 2^{31212310110221} is an apocalyptic number.

It is an amenable number.

31212310110221 is a deficient number, since it is larger than the sum of its proper divisors (96758151019).

31212310110221 is a wasteful number, since it uses less digits than its factorization.

31212310110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34971055.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 31212310110221 its reverse (12201101321213), we get a palindrome (43413411431434).

The spelling of 31212310110221 in words is "thirty-one trillion, two hundred twelve billion, three hundred ten million, one hundred ten thousand, two hundred twenty-one".