31311211012211 has 8 divisors (see below), whose sum is σ = 33727761914784. Its totient is φ = 28895802425280.

The previous prime is 31311211012199. The next prime is 31311211012231. The reversal of 31311211012211 is 11221011211313.

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 31311211012211 - 2³⁴ = 31294031143027 is a prime.

It is a super-2 number, since 2×31311211012211² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311211012231) 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, 285521975 + ... + 285631616.

It is an arithmetic number, because the mean of its divisors is an integer number (4215970239348).

Almost surely, 2^{31311211012211} is an apocalyptic number.

31311211012211 is a deficient number, since it is larger than the sum of its proper divisors (2416550902573).

31311211012211 is a wasteful number, since it uses less digits than its factorization.

31311211012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571157821.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 31311211012211 its reverse (11221011211313), we get a palindrome (42532222223524).

The spelling of 31311211012211 in words is "thirty-one trillion, three hundred eleven billion, two hundred eleven million, twelve thousand, two hundred eleven".