212440477 has 2 divisors, whose sum is σ = 212440478. Its totient is φ = 212440476.

The previous prime is 212440469. The next prime is 212440493. The reversal of 212440477 is 774044212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189915961 + 22524516 = 13781^2 + 4746^2 .

It is a cyclic number.

It is not a de Polignac number, because 212440477 - 2³ = 212440469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212443477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106220238 + 106220239.

It is an arithmetic number, because the mean of its divisors is an integer number (106220239).

Almost surely, 2^212440477 is an apocalyptic number.

It is an amenable number.

212440477 is a deficient number, since it is larger than the sum of its proper divisors (1).

212440477 is an equidigital number, since it uses as much as digits as its factorization.

212440477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 31.

The square root of 212440477 is about 14575.3379720677. The cubic root of 212440477 is about 596.6858733488.

Adding to 212440477 its reverse (774044212), we get a palindrome (986484689).

The spelling of 212440477 in words is "two hundred twelve million, four hundred forty thousand, four hundred seventy-seven".