215420220001 has 4 divisors (see below), whose sum is σ = 246194537152. Its totient is φ = 184645902852.

The previous prime is 215420219981. The next prime is 215420220011. The reversal of 215420220001 is 100022024512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215420220001 - 2¹¹ = 215420217953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215420220011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15387158565 + ... + 15387158578.

It is an arithmetic number, because the mean of its divisors is an integer number (61548634288).

Almost surely, 2^215420220001 is an apocalyptic number.

It is an amenable number.

215420220001 is a deficient number, since it is larger than the sum of its proper divisors (30774317151).

215420220001 is an equidigital number, since it uses as much as digits as its factorization.

215420220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30774317150.

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 215420220001 its reverse (100022024512), we get a palindrome (315442244513).

The spelling of 215420220001 in words is "two hundred fifteen billion, four hundred twenty million, two hundred twenty thousand, one".