212000009989357 has 2 divisors, whose sum is σ = 212000009989358. Its totient is φ = 212000009989356.

The previous prime is 212000009989333. The next prime is 212000009989373. The reversal of 212000009989357 is 753989900000212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196827824257156 + 15172185732201 = 14029534^2 + 3895149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212000009989357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212000009989298 and 212000009989307.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212000009987357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106000004994678 + 106000004994679.

It is an arithmetic number, because the mean of its divisors is an integer number (106000004994679).

Almost surely, 2^{212000009989357} is an apocalyptic number.

It is an amenable number.

212000009989357 is a deficient number, since it is larger than the sum of its proper divisors (1).

212000009989357 is an equidigital number, since it uses as much as digits as its factorization.

212000009989357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 55.

Adding to 212000009989357 its reverse (753989900000212), we get a palindrome (965989909989569).

The spelling of 212000009989357 in words is "two hundred twelve trillion, nine million, nine hundred eighty-nine thousand, three hundred fifty-seven".