213220778 has 8 divisors (see below), whose sum is σ = 319928772. Its totient is φ = 106577856.

The previous prime is 213220769. The next prime is 213220823. The reversal of 213220778 is 877022312.

It can be written as a sum of positive squares in 2 ways, for example, as 206985769 + 6235009 = 14387^2 + 2497^2 .

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

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, 7025 + ... + 21812.

Almost surely, 2^213220778 is an apocalyptic number.

213220778 is a deficient number, since it is larger than the sum of its proper divisors (106707994).

213220778 is a wasteful number, since it uses less digits than its factorization.

213220778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32536.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 213220778 is about 14602.0812900079. The cubic root of 213220778 is about 597.4155298035.

The spelling of 213220778 in words is "two hundred thirteen million, two hundred twenty thousand, seven hundred seventy-eight".