215621200250213 has 4 divisors (see below), whose sum is σ = 215621231945280. Its totient is φ = 215621168555148.

The previous prime is 215621200250191. The next prime is 215621200250297. The reversal of 215621200250213 is 312052002126512.

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 215621200250213 - 2⁸ = 215621200249957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215621200250213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215621200256213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1016423 + ... + 20791236.

It is an arithmetic number, because the mean of its divisors is an integer number (53905307986320).

Almost surely, 2^{215621200250213} is an apocalyptic number.

It is an amenable number.

215621200250213 is a deficient number, since it is larger than the sum of its proper divisors (31695067).

215621200250213 is an equidigital number, since it uses as much as digits as its factorization.

215621200250213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31695066.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 215621200250213 its reverse (312052002126512), we get a palindrome (527673202376725).

The spelling of 215621200250213 in words is "two hundred fifteen trillion, six hundred twenty-one billion, two hundred million, two hundred fifty thousand, two hundred thirteen".