215105442 has 16 divisors (see below), whose sum is σ = 430673760. Its totient is φ = 71624672.

The previous prime is 215105431. The next prime is 215105467. The reversal of 215105442 is 244501512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13092 + ... + 24527.

It is an arithmetic number, because the mean of its divisors is an integer number (26917110).

Almost surely, 2^215105442 is an apocalyptic number.

215105442 is an abundant number, since it is smaller than the sum of its proper divisors (215568318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215105442 is a wasteful number, since it uses less digits than its factorization.

215105442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38577.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 215105442 is about 14666.4734002418. The cubic root of 215105442 is about 599.1705594646.

Adding to 215105442 its reverse (244501512), we get a palindrome (459606954).

The spelling of 215105442 in words is "two hundred fifteen million, one hundred five thousand, four hundred forty-two".