215123101 has 2 divisors, whose sum is σ = 215123102. Its totient is φ = 215123100.

The previous prime is 215123093. The next prime is 215123123. The reversal of 215123101 is 101321512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110040100 + 105083001 = 10490^2 + 10251^2 .

It is a cyclic number.

It is not a de Polignac number, because 215123101 - 2³ = 215123093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215123171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107561550 + 107561551.

It is an arithmetic number, because the mean of its divisors is an integer number (107561551).

Almost surely, 2^215123101 is an apocalyptic number.

It is an amenable number.

215123101 is a deficient number, since it is larger than the sum of its proper divisors (1).

215123101 is an equidigital number, since it uses as much as digits as its factorization.

215123101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 215123101 is about 14667.0754071833. The cubic root of 215123101 is about 599.1869552428.

Adding to 215123101 its reverse (101321512), we get a palindrome (316444613).

It can be divided in two parts, 2151 and 23101, that added together give a palindrome (25252).

The spelling of 215123101 in words is "two hundred fifteen million, one hundred twenty-three thousand, one hundred one".