215113255121 has 2 divisors, whose sum is σ = 215113255122. Its totient is φ = 215113255120.

The previous prime is 215113255099. The next prime is 215113255199. The reversal of 215113255121 is 121552311512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197281658896 + 17831596225 = 444164^2 + 133535^2 .

It is a cyclic number.

It is not a de Polignac number, because 215113255121 - 2⁶ = 215113255057 is a prime.

It is not a weakly prime, because it can be changed into another prime (215113255921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107556627560 + 107556627561.

It is an arithmetic number, because the mean of its divisors is an integer number (107556627561).

Almost surely, 2^215113255121 is an apocalyptic number.

It is an amenable number.

215113255121 is a deficient number, since it is larger than the sum of its proper divisors (1).

215113255121 is an equidigital number, since it uses as much as digits as its factorization.

215113255121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000, while the sum is 29.

Adding to 215113255121 its reverse (121552311512), we get a palindrome (336665566633).

The spelling of 215113255121 in words is "two hundred fifteen billion, one hundred thirteen million, two hundred fifty-five thousand, one hundred twenty-one".