31434011221 has 4 divisors (see below), whose sum is σ = 31457108844. Its totient is φ = 31410913600.

The previous prime is 31434011207. The next prime is 31434011233. The reversal of 31434011221 is 12211043413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12211043413 = 23 ⋅530914931.

It can be written as a sum of positive squares in 2 ways, for example, as 13748735025 + 17685276196 = 117255^2 + 132986^2 .

It is a cyclic number.

It is not a de Polignac number, because 31434011221 - 2²¹ = 31431914069 is a prime.

It is a super-2 number, since 2×31434011221² (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 = 31434011192 and 31434011201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31434011261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11546770 + ... + 11549491.

It is an arithmetic number, because the mean of its divisors is an integer number (7864277211).

Almost surely, 2^31434011221 is an apocalyptic number.

It is an amenable number.

31434011221 is a deficient number, since it is larger than the sum of its proper divisors (23097623).

31434011221 is a wasteful number, since it uses less digits than its factorization.

31434011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23097622.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 31434011221 its reverse (12211043413), we get a palindrome (43645054634).

The spelling of 31434011221 in words is "thirty-one billion, four hundred thirty-four million, eleven thousand, two hundred twenty-one".