31002120011 has 4 divisors (see below), whose sum is σ = 31173402624. Its totient is φ = 30830837400.

The previous prime is 31002120007. The next prime is 31002120103. The reversal of 31002120011 is 11002120013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11002120013 = 4663 ⋅2359451.

It is a cyclic number.

It is not a de Polignac number, because 31002120011 - 2² = 31002120007 is a prime.

It is a super-2 number, since 2×31002120011² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31002119974 and 31002120001.

It is not an unprimeable number, because it can be changed into a prime (31002120001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85641035 + ... + 85641396.

It is an arithmetic number, because the mean of its divisors is an integer number (7793350656).

Almost surely, 2^31002120011 is an apocalyptic number.

31002120011 is a deficient number, since it is larger than the sum of its proper divisors (171282613).

31002120011 is a wasteful number, since it uses less digits than its factorization.

31002120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171282612.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 31002120011 its reverse (11002120013), we get a palindrome (42004240024).

The spelling of 31002120011 in words is "thirty-one billion, two million, one hundred twenty thousand, eleven".