31144241221 has 4 divisors (see below), whose sum is σ = 31147111744. Its totient is φ = 31141370700.

The previous prime is 31144241209. The next prime is 31144241239. The reversal of 31144241221 is 12214244113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12214244113 = 41 ⋅297908393.

It is a cyclic number.

It is not a de Polignac number, because 31144241221 - 2⁹ = 31144240709 is a prime.

It is a super-2 number, since 2×31144241221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37144241221) 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, 1418925 + ... + 1440706.

It is an arithmetic number, because the mean of its divisors is an integer number (7786777936).

Almost surely, 2^31144241221 is an apocalyptic number.

It is an amenable number.

31144241221 is a deficient number, since it is larger than the sum of its proper divisors (2870523).

31144241221 is a wasteful number, since it uses less digits than its factorization.

31144241221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2870522.

The product of its digits is 1536, while the sum is 25.

Adding to 31144241221 its reverse (12214244113), we get a palindrome (43358485334).

The spelling of 31144241221 in words is "thirty-one billion, one hundred forty-four million, two hundred forty-one thousand, two hundred twenty-one".