31421234221331 has 4 divisors (see below), whose sum is σ = 31435193012664. Its totient is φ = 31407275430000.

The previous prime is 31421234221327. The next prime is 31421234221339. The reversal of 31421234221331 is 13312243212413.

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 31421234221331 - 2² = 31421234221327 is a prime.

It is a super-2 number, since 2×31421234221331² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31421234221339) 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, 6979392290 + ... + 6979396791.

It is an arithmetic number, because the mean of its divisors is an integer number (7858798253166).

Almost surely, 2^{31421234221331} is an apocalyptic number.

31421234221331 is a deficient number, since it is larger than the sum of its proper divisors (13958791333).

31421234221331 is a wasteful number, since it uses less digits than its factorization.

31421234221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13958791332.

The product of its digits is 20736, while the sum is 32.

Adding to 31421234221331 its reverse (13312243212413), we get a palindrome (44733477433744).

The spelling of 31421234221331 in words is "thirty-one trillion, four hundred twenty-one billion, two hundred thirty-four million, two hundred twenty-one thousand, three hundred thirty-one".