212120221001057 has 2 divisors, whose sum is σ = 212120221001058. Its totient is φ = 212120221001056.

The previous prime is 212120221000999. The next prime is 212120221001083. The reversal of 212120221001057 is 750100122021212.

It is an a-pointer prime, because the next prime (212120221001083) can be obtained adding 212120221001057 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207724652974336 + 4395568026721 = 14412656^2 + 2096561^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120221001057 - 2²² = 212120216806753 is a prime.

It is not a weakly prime, because it can be changed into another prime (212120221031057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060110500528 + 106060110500529.

It is an arithmetic number, because the mean of its divisors is an integer number (106060110500529).

Almost surely, 2^{212120221001057} is an apocalyptic number.

It is an amenable number.

212120221001057 is a deficient number, since it is larger than the sum of its proper divisors (1).

212120221001057 is an equidigital number, since it uses as much as digits as its factorization.

212120221001057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

Adding to 212120221001057 its reverse (750100122021212), we get a palindrome (962220343022269).

The spelling of 212120221001057 in words is "two hundred twelve trillion, one hundred twenty billion, two hundred twenty-one million, one thousand, fifty-seven".