31211022212 has 6 divisors (see below), whose sum is σ = 54619288878. Its totient is φ = 15605511104.

The previous prime is 31211022203. The next prime is 31211022221. The reversal of 31211022212 is 21222011213.

It is an interprime number because it is at equal distance from previous prime (31211022203) and next prime (31211022221).

It can be written as a sum of positive squares in only one way, i.e., 27737570116 + 3473452096 = 166546^2 + 58936^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3901377773 + ... + 3901377780.

It is an arithmetic number, because the mean of its divisors is an integer number (9103214813).

Almost surely, 2^31211022212 is an apocalyptic number.

It is an amenable number.

31211022212 is a deficient number, since it is larger than the sum of its proper divisors (23408266666).

31211022212 is a wasteful number, since it uses less digits than its factorization.

31211022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7802755557 (or 7802755555 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 31211022212 its reverse (21222011213), we get a palindrome (52433033425).

The spelling of 31211022212 in words is "thirty-one billion, two hundred eleven million, twenty-two thousand, two hundred twelve".