212978612393 has 2 divisors, whose sum is σ = 212978612394. Its totient is φ = 212978612392.

The previous prime is 212978612383. The next prime is 212978612411. The reversal of 212978612393 is 393216879212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209510344729 + 3468267664 = 457723^2 + 58892^2 .

It is a cyclic number.

It is not a de Polignac number, because 212978612393 - 2¹⁴ = 212978596009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (212978612323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106489306196 + 106489306197.

It is an arithmetic number, because the mean of its divisors is an integer number (106489306197).

Almost surely, 2^212978612393 is an apocalyptic number.

It is an amenable number.

212978612393 is a deficient number, since it is larger than the sum of its proper divisors (1).

212978612393 is an equidigital number, since it uses as much as digits as its factorization.

212978612393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The spelling of 212978612393 in words is "two hundred twelve billion, nine hundred seventy-eight million, six hundred twelve thousand, three hundred ninety-three".