212111377 has 2 divisors, whose sum is σ = 212111378. Its totient is φ = 212111376.

The previous prime is 212111371. The next prime is 212111399. The reversal of 212111377 is 773111212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209554576 + 2556801 = 14476^2 + 1599^2 .

It is a cyclic number.

It is not a de Polignac number, because 212111377 - 2³ = 212111369 is a prime.

It is a super-2 number, since 2×212111377² = 89982472505672258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212111371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106055688 + 106055689.

It is an arithmetic number, because the mean of its divisors is an integer number (106055689).

Almost surely, 2^212111377 is an apocalyptic number.

It is an amenable number.

212111377 is a deficient number, since it is larger than the sum of its proper divisors (1).

212111377 is an equidigital number, since it uses as much as digits as its factorization.

212111377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 588, while the sum is 25.

The square root of 212111377 is about 14564.0439782363. The cubic root of 212111377 is about 596.3775974931.

Adding to 212111377 its reverse (773111212), we get a palindrome (985222589).

It can be divided in two parts, 2121113 and 77, that multiplied together give a triangular number (163325701 = T₁₈₀₇₃).

The spelling of 212111377 in words is "two hundred twelve million, one hundred eleven thousand, three hundred seventy-seven".