31212023011 has 4 divisors (see below), whose sum is σ = 33612947872. Its totient is φ = 28811098152.

The previous prime is 31212022949. The next prime is 31212023027. The reversal of 31212023011 is 11032021213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11032021213 = 409 ⋅26973157.

It is a cyclic number.

It is not a de Polignac number, because 31212023011 - 2¹³ = 31212014819 is a prime.

It is a super-2 number, since 2×31212023011² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212023071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1200462411 + ... + 1200462436.

It is an arithmetic number, because the mean of its divisors is an integer number (8403236968).

Almost surely, 2^31212023011 is an apocalyptic number.

31212023011 is a deficient number, since it is larger than the sum of its proper divisors (2400924861).

31212023011 is a wasteful number, since it uses less digits than its factorization.

31212023011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400924860.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31212023011 its reverse (11032021213), we get a palindrome (42244044224).

It can be divided in two parts, 3121202 and 3011, that added together give a palindrome (3124213).

The spelling of 31212023011 in words is "thirty-one billion, two hundred twelve million, twenty-three thousand, eleven".