215521042541201 has 16 divisors (see below), whose sum is σ = 226326765990528. Its totient is φ = 204834955353600.

The previous prime is 215521042541191. The next prime is 215521042541263. The reversal of 215521042541201 is 102145240125512.

It is a cyclic number.

It is not a de Polignac number, because 215521042541201 - 2¹⁸ = 215521042279057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215521042541801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331204481 + ... + 331854561.

It is an arithmetic number, because the mean of its divisors is an integer number (14145422874408).

Almost surely, 2^{215521042541201} is an apocalyptic number.

It is an amenable number.

215521042541201 is a deficient number, since it is larger than the sum of its proper divisors (10805723449327).

215521042541201 is a wasteful number, since it uses less digits than its factorization.

215521042541201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742072.

The product of its (nonzero) digits is 32000, while the sum is 35.

Adding to 215521042541201 its reverse (102145240125512), we get a palindrome (317666282666713).

The spelling of 215521042541201 in words is "two hundred fifteen trillion, five hundred twenty-one billion, forty-two million, five hundred forty-one thousand, two hundred one".