31212412421 has 2 divisors, whose sum is σ = 31212412422. Its totient is φ = 31212412420.

The previous prime is 31212412411. The next prime is 31212412433. The reversal of 31212412421 is 12421421213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31092268900 + 120143521 = 176330^2 + 10961^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212412421 - 2¹⁰ = 31212411397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212412411) 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, 15606206210 + 15606206211.

It is an arithmetic number, because the mean of its divisors is an integer number (15606206211).

Almost surely, 2^31212412421 is an apocalyptic number.

It is an amenable number.

31212412421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212412421 is an equidigital number, since it uses as much as digits as its factorization.

31212412421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 23.

Adding to 31212412421 its reverse (12421421213), we get a palindrome (43633833634).

The spelling of 31212412421 in words is "thirty-one billion, two hundred twelve million, four hundred twelve thousand, four hundred twenty-one".