220021307 has 4 divisors (see below), whose sum is σ = 240023256. Its totient is φ = 200019360.

The previous prime is 220021301. The next prime is 220021313. The reversal of 220021307 is 703120022.

220021307 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (220021301) and next prime (220021313).

It is a cyclic number.

It is not a de Polignac number, because 220021307 - 2¹² = 220017211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220021301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10000958 + ... + 10000979.

It is an arithmetic number, because the mean of its divisors is an integer number (60005814).

Almost surely, 2^220021307 is an apocalyptic number.

220021307 is a deficient number, since it is larger than the sum of its proper divisors (20001949).

220021307 is a wasteful number, since it uses less digits than its factorization.

220021307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20001948.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 220021307 is about 14833.1152156248. The cubic root of 220021307 is about 603.7005618880.

Adding to 220021307 its reverse (703120022), we get a palindrome (923141329).

The spelling of 220021307 in words is "two hundred twenty million, twenty-one thousand, three hundred seven".