31040111221 has 4 divisors (see below), whose sum is σ = 35474412832. Its totient is φ = 26605809612.

The previous prime is 31040111213. The next prime is 31040111233. The reversal of 31040111221 is 12211104013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31040111221 - 2³ = 31040111213 is a prime.

It is a super-2 number, since 2×31040111221² (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 = 31040111195 and 31040111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31040111321) 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, 2217150795 + ... + 2217150808.

It is an arithmetic number, because the mean of its divisors is an integer number (8868603208).

Almost surely, 2^31040111221 is an apocalyptic number.

It is an amenable number.

31040111221 is a deficient number, since it is larger than the sum of its proper divisors (4434301611).

31040111221 is an equidigital number, since it uses as much as digits as its factorization.

31040111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4434301610.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31040111221 its reverse (12211104013), we get a palindrome (43251215234).

The spelling of 31040111221 in words is "thirty-one billion, forty million, one hundred eleven thousand, two hundred twenty-one".