215450021011 has 2 divisors, whose sum is σ = 215450021012. Its totient is φ = 215450021010.

The previous prime is 215450021009. The next prime is 215450021041. The reversal of 215450021011 is 110120054512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215450021011 - 2¹ = 215450021009 is a prime.

Together with 215450021009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (215450021041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107725010505 + 107725010506.

It is an arithmetic number, because the mean of its divisors is an integer number (107725010506).

Almost surely, 2^215450021011 is an apocalyptic number.

215450021011 is a deficient number, since it is larger than the sum of its proper divisors (1).

215450021011 is an equidigital number, since it uses as much as digits as its factorization.

215450021011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 215450021011 its reverse (110120054512), we get a palindrome (325570075523).

The spelling of 215450021011 in words is "two hundred fifteen billion, four hundred fifty million, twenty-one thousand, eleven".