31031255421 has 6 divisors (see below), whose sum is σ = 44822924510. Its totient is φ = 20687503608.

The previous prime is 31031255417. The next prime is 31031255441. The reversal of 31031255421 is 12455213013.

31031255421 is a `hidden beast` number, since 3 + 103 + 1 + 2 + 554 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25007943321 + 6023312100 = 158139^2 + 77610^2 .

It is not a de Polignac number, because 31031255421 - 2² = 31031255417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031255441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1723958626 + ... + 1723958643.

Almost surely, 2^31031255421 is an apocalyptic number.

It is an amenable number.

31031255421 is a deficient number, since it is larger than the sum of its proper divisors (13791669089).

31031255421 is a wasteful number, since it uses less digits than its factorization.

31031255421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3447917275 (or 3447917272 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 31031255421 its reverse (12455213013), we get a palindrome (43486468434).

The spelling of 31031255421 in words is "thirty-one billion, thirty-one million, two hundred fifty-five thousand, four hundred twenty-one".