312121011 has 16 divisors (see below), whose sum is σ = 427948704. Its totient is φ = 202201344.

The previous prime is 312120973. The next prime is 312121013. The reversal of 312121011 is 110121213.

It is not a de Polignac number, because 312121011 - 2⁹ = 312120499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (312121013) 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, 131245 + ... + 133601.

It is an arithmetic number, because the mean of its divisors is an integer number (26746794).

Almost surely, 2^312121011 is an apocalyptic number.

312121011 is a deficient number, since it is larger than the sum of its proper divisors (115827693).

312121011 is a wasteful number, since it uses less digits than its factorization.

312121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 312121011 is about 17666.9468499795. The cubic root of 312121011 is about 678.3299639969.

Adding to 312121011 its reverse (110121213), we get a palindrome (422242224).

It can be divided in two parts, 31212 and 1011, that added together give a palindrome (32223).

The spelling of 312121011 in words is "three hundred twelve million, one hundred twenty-one thousand, eleven".