215450021071 has 2 divisors, whose sum is σ = 215450021072. Its totient is φ = 215450021070.

The previous prime is 215450021041. The next prime is 215450021077. The reversal of 215450021071 is 170120054512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215450021071 - 2⁹ = 215450020559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215450021077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107725010535 + 107725010536.

It is an arithmetic number, because the mean of its divisors is an integer number (107725010536).

Almost surely, 2^215450021071 is an apocalyptic number.

215450021071 is a deficient number, since it is larger than the sum of its proper divisors (1).

215450021071 is an equidigital number, since it uses as much as digits as its factorization.

215450021071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 28.

Adding to 215450021071 its reverse (170120054512), we get a palindrome (385570075583).

The spelling of 215450021071 in words is "two hundred fifteen billion, four hundred fifty million, twenty-one thousand, seventy-one".