31010212111221 has 48 divisors (see below), whose sum is σ = 51601619317248. Its totient is φ = 17578690567200.

The previous prime is 31010212111217. The next prime is 31010212111243. The reversal of 31010212111221 is 12211121201013.

It is a happy number.

31010212111221 is a `hidden beast` number, since 310 + 1 + 0 + 2 + 121 + 11 + 221 = 666.

It is not a de Polignac number, because 31010212111221 - 2² = 31010212111217 is a prime.

It is a super-2 number, since 2×31010212111221² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31010212111194 and 31010212111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31010212111421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 281566 + ... + 7880336.

It is an arithmetic number, because the mean of its divisors is an integer number (1075033735776).

Almost surely, 2^{31010212111221} is an apocalyptic number.

It is an amenable number.

31010212111221 is a deficient number, since it is larger than the sum of its proper divisors (20591407206027).

31010212111221 is a wasteful number, since it uses less digits than its factorization.

31010212111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7599302 (or 7599299 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 31010212111221 its reverse (12211121201013), we get a palindrome (43221333312234).

The spelling of 31010212111221 in words is "thirty-one trillion, ten billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-one".