215622121 has 12 divisors (see below), whose sum is σ = 255239236. Its totient is φ = 180940320.

The previous prime is 215622119. The next prime is 215622133. The reversal of 215622121 is 121226512.

215622121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12702096 + 202920025 = 3564^2 + 14245^2 .

It is not a de Polignac number, because 215622121 - 2¹ = 215622119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215622092 and 215622101.

It is not an unprimeable number, because it can be changed into a prime (215622151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66966 + ... + 70111.

Almost surely, 2^215622121 is an apocalyptic number.

It is an amenable number.

215622121 is a deficient number, since it is larger than the sum of its proper divisors (39617115).

215622121 is a wasteful number, since it uses less digits than its factorization.

215622121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137112 (or 137101 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 215622121 is about 14684.0771245591. The cubic root of 215622121 is about 599.6499078025.

Adding to 215622121 its reverse (121226512), we get a palindrome (336848633).

The spelling of 215622121 in words is "two hundred fifteen million, six hundred twenty-two thousand, one hundred twenty-one".