215143401 has 16 divisors (see below), whose sum is σ = 318068928. Its totient is φ = 128251200.

The previous prime is 215143399. The next prime is 215143417. The reversal of 215143401 is 104341512.

It is not a de Polignac number, because 215143401 - 2¹ = 215143399 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215143421) 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, 51426 + ... + 55451.

It is an arithmetic number, because the mean of its divisors is an integer number (19879308).

Almost surely, 2^215143401 is an apocalyptic number.

It is an amenable number.

215143401 is a deficient number, since it is larger than the sum of its proper divisors (102925527).

215143401 is a wasteful number, since it uses less digits than its factorization.

215143401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106952.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 215143401 is about 14667.7674170270. The cubic root of 215143401 is about 599.2058019908.

Adding to 215143401 its reverse (104341512), we get a palindrome (319484913).

The spelling of 215143401 in words is "two hundred fifteen million, one hundred forty-three thousand, four hundred one".