212905843 has 2 divisors, whose sum is σ = 212905844. Its totient is φ = 212905842.

The previous prime is 212905837. The next prime is 212905877. The reversal of 212905843 is 348509212.

It is an a-pointer prime, because the next prime (212905877) can be obtained adding 212905843 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212905843 - 2²¹ = 210808691 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212905799 and 212905808.

It is not a weakly prime, because it can be changed into another prime (212965843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106452921 + 106452922.

It is an arithmetic number, because the mean of its divisors is an integer number (106452922).

Almost surely, 2^212905843 is an apocalyptic number.

212905843 is a deficient number, since it is larger than the sum of its proper divisors (1).

212905843 is an equidigital number, since it uses as much as digits as its factorization.

212905843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 212905843 is about 14591.2933970913. The cubic root of 212905843 is about 597.1212499009.

The spelling of 212905843 in words is "two hundred twelve million, nine hundred five thousand, eight hundred forty-three".