220021901 has 8 divisors (see below), whose sum is σ = 240645600. Its totient is φ = 199501840.

The previous prime is 220021897. The next prime is 220021981. The reversal of 220021901 is 109120022.

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

It is a cyclic number.

It is not a de Polignac number, because 220021901 - 2² = 220021897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220021901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21431 + ... + 29988.

It is an arithmetic number, because the mean of its divisors is an integer number (30080700).

Almost surely, 2^220021901 is an apocalyptic number.

It is an amenable number.

220021901 is a deficient number, since it is larger than the sum of its proper divisors (20623699).

220021901 is a wasteful number, since it uses less digits than its factorization.

220021901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51819.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 220021901 is about 14833.1352383776. The cubic root of 220021901 is about 603.7011051654.

Adding to 220021901 its reverse (109120022), we get a palindrome (329141923).

The spelling of 220021901 in words is "two hundred twenty million, twenty-one thousand, nine hundred one".