215105242 has 16 divisors (see below), whose sum is σ = 357246432. Its totient is φ = 96315120.

The previous prime is 215105239. The next prime is 215105279. The reversal of 215105242 is 242501512.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 71493 + ... + 74440.

It is an arithmetic number, because the mean of its divisors is an integer number (22327902).

Almost surely, 2^215105242 is an apocalyptic number.

215105242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

215105242 is a deficient number, since it is larger than the sum of its proper divisors (142141190).

215105242 is a wasteful number, since it uses less digits than its factorization.

215105242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146013.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 215105242 is about 14666.4665819685. The cubic root of 215105242 is about 599.1703737663.

Adding to 215105242 its reverse (242501512), we get a palindrome (457606754).

The spelling of 215105242 in words is "two hundred fifteen million, one hundred five thousand, two hundred forty-two".