215642022 has 32 divisors (see below), whose sum is σ = 436948992. Its totient is φ = 70941984.

The previous prime is 215641939. The next prime is 215642027. The reversal of 215642022 is 220246512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 215641983 and 215642001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215642027) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 245448 + ... + 246324.

It is an arithmetic number, because the mean of its divisors is an integer number (13654656).

Almost surely, 2^215642022 is an apocalyptic number.

215642022 is an abundant number, since it is smaller than the sum of its proper divisors (221306970).

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

215642022 is a wasteful number, since it uses less digits than its factorization.

215642022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 215642022 is about 14684.7547476967. The cubic root of 215642022 is about 599.6683556093.

Adding to 215642022 its reverse (220246512), we get a palindrome (435888534).

The spelling of 215642022 in words is "two hundred fifteen million, six hundred forty-two thousand, twenty-two".