220021870 has 8 divisors (see below), whose sum is σ = 396039384. Its totient is φ = 88008744.

The previous prime is 220021861. The next prime is 220021889. The reversal of 220021870 is 78120022.

220021870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11001084 + ... + 11001103.

It is an arithmetic number, because the mean of its divisors is an integer number (49504923).

Almost surely, 2^220021870 is an apocalyptic number.

220021870 is a deficient number, since it is larger than the sum of its proper divisors (176017514).

220021870 is a wasteful number, since it uses less digits than its factorization.

220021870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22002194.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 220021870 is about 14833.1341934198. The cubic root of 220021870 is about 603.7010768125.

Adding to 220021870 its reverse (78120022), we get a palindrome (298141892).

The spelling of 220021870 in words is "two hundred twenty million, twenty-one thousand, eight hundred seventy".