212154220441 has 2 divisors, whose sum is σ = 212154220442. Its totient is φ = 212154220440.

The previous prime is 212154220427. The next prime is 212154220477. The reversal of 212154220441 is 144022451212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131747946841 + 80406273600 = 362971^2 + 283560^2 .

It is a cyclic number.

It is not a de Polignac number, because 212154220441 - 2³³ = 203564285849 is a prime.

It is not a weakly prime, because it can be changed into another prime (212154220841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106077110220 + 106077110221.

It is an arithmetic number, because the mean of its divisors is an integer number (106077110221).

Almost surely, 2^212154220441 is an apocalyptic number.

It is an amenable number.

212154220441 is a deficient number, since it is larger than the sum of its proper divisors (1).

212154220441 is an equidigital number, since it uses as much as digits as its factorization.

212154220441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5120, while the sum is 28.

Adding to 212154220441 its reverse (144022451212), we get a palindrome (356176671653).

The spelling of 212154220441 in words is "two hundred twelve billion, one hundred fifty-four million, two hundred twenty thousand, four hundred forty-one".