215313021251 has 2 divisors, whose sum is σ = 215313021252. Its totient is φ = 215313021250.

The previous prime is 215313021239. The next prime is 215313021269. The reversal of 215313021251 is 152120313512.

215313021251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215313021251 - 2¹⁴ = 215313004867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215313021251.

It is not a weakly prime, because it can be changed into another prime (215313021211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107656510625 + 107656510626.

It is an arithmetic number, because the mean of its divisors is an integer number (107656510626).

Almost surely, 2^215313021251 is an apocalyptic number.

215313021251 is a deficient number, since it is larger than the sum of its proper divisors (1).

215313021251 is an equidigital number, since it uses as much as digits as its factorization.

215313021251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 215313021251 its reverse (152120313512), we get a palindrome (367433334763).

The spelling of 215313021251 in words is "two hundred fifteen billion, three hundred thirteen million, twenty-one thousand, two hundred fifty-one".