1000220021 has 8 divisors (see below), whose sum is σ = 1098640320. Its totient is φ = 906377472.

The previous prime is 1000219999. The next prime is 1000220029. The reversal of 1000220021 is 1200220001.

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 1000220021 - 2¹⁸ = 999957877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000219990 and 1000220008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000220029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1143980 + ... + 1144853.

It is an arithmetic number, because the mean of its divisors is an integer number (137330040).

Almost surely, 2^1000220021 is an apocalyptic number.

It is an amenable number.

1000220021 is a deficient number, since it is larger than the sum of its proper divisors (98420299).

1000220021 is a wasteful number, since it uses less digits than its factorization.

1000220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288875.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1000220021 is about 31626.2552478159. The cubic root of 1000220021 is about 1000.0733349552.

Adding to 1000220021 its reverse (1200220001), we get a palindrome (2200440022).

The spelling of 1000220021 in words is "one billion, two hundred twenty thousand, twenty-one".