215520211412201 has 4 divisors (see below), whose sum is σ = 215520558244692. Its totient is φ = 215519864579712.

The previous prime is 215520211412183. The next prime is 215520211412221. The reversal of 215520211412201 is 102214112025512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25956742490176 + 189563468922025 = 5094776^2 + 13768205^2 .

It is a cyclic number.

It is not a de Polignac number, because 215520211412201 - 2²⁶ = 215520144303337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215520211412221) 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, 172482476 + ... + 173727501.

It is an arithmetic number, because the mean of its divisors is an integer number (53880139561173).

Almost surely, 2^{215520211412201} is an apocalyptic number.

It is an amenable number.

215520211412201 is a deficient number, since it is larger than the sum of its proper divisors (346832491).

215520211412201 is an equidigital number, since it uses as much as digits as its factorization.

215520211412201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346832490.

The product of its (nonzero) digits is 3200, while the sum is 29.

Adding to 215520211412201 its reverse (102214112025512), we get a palindrome (317734323437713).

The spelling of 215520211412201 in words is "two hundred fifteen trillion, five hundred twenty billion, two hundred eleven million, four hundred twelve thousand, two hundred one".