31211230221211 has 16 divisors (see below), whose sum is σ = 31754221032960. Its totient is φ = 30670525052640.

The previous prime is 31211230221209. The next prime is 31211230221239. The reversal of 31211230221211 is 11212203211213.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31211230221211 - 2¹ = 31211230221209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31211231221211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271299660 + ... + 271414678.

It is an arithmetic number, because the mean of its divisors is an integer number (1984638814560).

Almost surely, 2^{31211230221211} is an apocalyptic number.

31211230221211 is a deficient number, since it is larger than the sum of its proper divisors (542990811749).

31211230221211 is a wasteful number, since it uses less digits than its factorization.

31211230221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124914.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 31211230221211 its reverse (11212203211213), we get a palindrome (42423433432424).

The spelling of 31211230221211 in words is "thirty-one trillion, two hundred eleven billion, two hundred thirty million, two hundred twenty-one thousand, two hundred eleven".