210001219999957 has 2 divisors, whose sum is σ = 210001219999958. Its totient is φ = 210001219999956.

The previous prime is 210001219999951. The next prime is 210001220000017. The reversal of 210001219999957 is 759999912100012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134961984574596 + 75039235425361 = 11617314^2 + 8662519^2 .

It is a cyclic number.

It is not a de Polignac number, because 210001219999957 - 2⁴³ = 201205126977749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210001219999951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105000609999978 + 105000609999979.

It is an arithmetic number, because the mean of its divisors is an integer number (105000609999979).

Almost surely, 2^{210001219999957} is an apocalyptic number.

It is an amenable number.

210001219999957 is a deficient number, since it is larger than the sum of its proper divisors (1).

210001219999957 is an equidigital number, since it uses as much as digits as its factorization.

210001219999957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8266860, while the sum is 64.

The spelling of 210001219999957 in words is "two hundred ten trillion, one billion, two hundred nineteen million, nine hundred ninety-nine thousand, nine hundred fifty-seven".