31351421211 has 32 divisors (see below), whose sum is σ = 46141353216. Its totient is φ = 18776880000.

The previous prime is 31351421209. The next prime is 31351421237. The reversal of 31351421211 is 11212415313.

It is not a de Polignac number, because 31351421211 - 2¹ = 31351421209 is a prime.

It is a super-2 number, since 2×31351421211² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31351421281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1794460 + ... + 1811846.

It is an arithmetic number, because the mean of its divisors is an integer number (1441917288).

Almost surely, 2^31351421211 is an apocalyptic number.

31351421211 is a deficient number, since it is larger than the sum of its proper divisors (14789932005).

31351421211 is a wasteful number, since it uses less digits than its factorization.

31351421211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18043.

The product of its digits is 720, while the sum is 24.

Adding to 31351421211 its reverse (11212415313), we get a palindrome (42563836524).

The spelling of 31351421211 in words is "thirty-one billion, three hundred fifty-one million, four hundred twenty-one thousand, two hundred eleven".