31212121433 has 2 divisors, whose sum is σ = 31212121434. Its totient is φ = 31212121432.

The previous prime is 31212121417. The next prime is 31212121483. The reversal of 31212121433 is 33412121213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27971893504 + 3240227929 = 167248^2 + 56923^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212121433 - 2⁴ = 31212121417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31212121399 and 31212121408.

It is not a weakly prime, because it can be changed into another prime (31212121483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606060716 + 15606060717.

It is an arithmetic number, because the mean of its divisors is an integer number (15606060717).

Almost surely, 2^31212121433 is an apocalyptic number.

It is an amenable number.

31212121433 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212121433 is an equidigital number, since it uses as much as digits as its factorization.

31212121433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

Adding to 31212121433 its reverse (33412121213), we get a palindrome (64624242646).

The spelling of 31212121433 in words is "thirty-one billion, two hundred twelve million, one hundred twenty-one thousand, four hundred thirty-three".