31011121201123 has 4 divisors (see below), whose sum is σ = 35441281372720. Its totient is φ = 26580961029528.

The previous prime is 31011121201069. The next prime is 31011121201129. The reversal of 31011121201123 is 32110212111013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31011121201123 - 2²⁵ = 31011087646691 is a prime.

It is a super-2 number, since 2×31011121201123² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31011121201123.

It is not an unprimeable number, because it can be changed into a prime (31011121201129) 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, 2215080085788 + ... + 2215080085801.

It is an arithmetic number, because the mean of its divisors is an integer number (8860320343180).

Almost surely, 2^{31011121201123} is an apocalyptic number.

31011121201123 is a deficient number, since it is larger than the sum of its proper divisors (4430160171597).

31011121201123 is an equidigital number, since it uses as much as digits as its factorization.

31011121201123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4430160171596.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 31011121201123 its reverse (32110212111013), we get a palindrome (63121333312136).

The spelling of 31011121201123 in words is "thirty-one trillion, eleven billion, one hundred twenty-one million, two hundred one thousand, one hundred twenty-three".