215221450 has 24 divisors (see below), whose sum is σ = 409625568. Its totient is φ = 84085680.

The previous prime is 215221421. The next prime is 215221463. The reversal of 215221450 is 54122512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47902 + ... + 52201.

It is an arithmetic number, because the mean of its divisors is an integer number (17067732).

Almost surely, 2^215221450 is an apocalyptic number.

215221450 is a deficient number, since it is larger than the sum of its proper divisors (194404118).

215221450 is a wasteful number, since it uses less digits than its factorization.

215221450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100158 (or 100153 counting only the distinct ones).

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

The square root of 215221450 is about 14670.4277374588. The cubic root of 215221450 is about 599.2782525195.

Adding to 215221450 its reverse (54122512), we get a palindrome (269343962).

The spelling of 215221450 in words is "two hundred fifteen million, two hundred twenty-one thousand, four hundred fifty".