215540222 has 8 divisors (see below), whose sum is σ = 337367376. Its totient is φ = 103084432.

The previous prime is 215540219. The next prime is 215540231. The reversal of 215540222 is 222045512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2342783 + ... + 2342874.

It is an arithmetic number, because the mean of its divisors is an integer number (42170922).

Almost surely, 2^215540222 is an apocalyptic number.

215540222 is a deficient number, since it is larger than the sum of its proper divisors (121827154).

215540222 is a wasteful number, since it uses less digits than its factorization.

215540222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685682.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 215540222 is about 14681.2881587414. The cubic root of 215540222 is about 599.5739772089.

Adding to 215540222 its reverse (222045512), we get a palindrome (437585734).

The spelling of 215540222 in words is "two hundred fifteen million, five hundred forty thousand, two hundred twenty-two".