215130405 has 16 divisors (see below), whose sum is σ = 393381504. Its totient is φ = 98345280.

The previous prime is 215130401. The next prime is 215130413. The reversal of 215130405 is 504031512.

It is not a de Polignac number, because 215130405 - 2² = 215130401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215130401) 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, 1024326 + ... + 1024535.

It is an arithmetic number, because the mean of its divisors is an integer number (24586344).

Almost surely, 2^215130405 is an apocalyptic number.

It is an amenable number.

215130405 is a deficient number, since it is larger than the sum of its proper divisors (178251099).

215130405 is a wasteful number, since it uses less digits than its factorization.

215130405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048876.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 215130405 is about 14667.3243981307. The cubic root of 215130405 is about 599.1937364950.

Adding to 215130405 its reverse (504031512), we get a palindrome (719161917).

The spelling of 215130405 in words is "two hundred fifteen million, one hundred thirty thousand, four hundred five".