215010002221 has 12 divisors (see below), whose sum is σ = 250339270140. Its totient is φ = 184128060480.

The previous prime is 215010002191. The next prime is 215010002239. The reversal of 215010002221 is 122200010512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5717476996 + 209292525225 = 75614^2 + 457485^2 .

It is not a de Polignac number, because 215010002221 - 2¹⁷ = 215009871149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215010002195 and 215010002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215010006221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1924000 + ... + 2032681.

It is an arithmetic number, because the mean of its divisors is an integer number (20861605845).

Almost surely, 2^215010002221 is an apocalyptic number.

It is an amenable number.

215010002221 is a deficient number, since it is larger than the sum of its proper divisors (35329267919).

215010002221 is a wasteful number, since it uses less digits than its factorization.

215010002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3957804 (or 3957797 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 215010002221 its reverse (122200010512), we get a palindrome (337210012733).

The spelling of 215010002221 in words is "two hundred fifteen billion, ten million, two thousand, two hundred twenty-one".