31030121211 has 8 divisors (see below), whose sum is σ = 41391177744. Its totient is φ = 20677906080.

The previous prime is 31030121197. The next prime is 31030121251. The reversal of 31030121211 is 11212103013.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-31030121211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31030121251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2202156 + ... + 2216201.

It is an arithmetic number, because the mean of its divisors is an integer number (5173897218).

Almost surely, 2^31030121211 is an apocalyptic number.

31030121211 is a deficient number, since it is larger than the sum of its proper divisors (10361056533).

31030121211 is a wasteful number, since it uses less digits than its factorization.

31030121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4420701.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31030121211 its reverse (11212103013), we get a palindrome (42242224224).

The spelling of 31030121211 in words is "thirty-one billion, thirty million, one hundred twenty-one thousand, two hundred eleven".