31220112011 has 8 divisors (see below), whose sum is σ = 34178654784. Its totient is φ = 28281627720.

The previous prime is 31220111999. The next prime is 31220112013. The reversal of 31220112011 is 11021102213.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31220112011 is a prime.

It is a super-4 number, since 4×31220112011⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31220112013) 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, 5011361 + ... + 5017586.

It is an arithmetic number, because the mean of its divisors is an integer number (4272331848).

Almost surely, 2^31220112011 is an apocalyptic number.

31220112011 is a deficient number, since it is larger than the sum of its proper divisors (2958542773).

31220112011 is a wasteful number, since it uses less digits than its factorization.

31220112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10029241.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 31220112011 its reverse (11021102213), we get a palindrome (42241214224).

The spelling of 31220112011 in words is "thirty-one billion, two hundred twenty million, one hundred twelve thousand, eleven".