1000628021 has 8 divisors (see below), whose sum is σ = 1009356600. Its totient is φ = 991933632.

The previous prime is 1000628003. The next prime is 1000628029. The reversal of 1000628021 is 1208260001.

It can be written as a sum of positive squares in 4 ways, for example, as 562353796 + 438274225 = 23714^2 + 20935^2 .

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 1000628021 - 2¹⁰ = 1000626997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000627984 and 1000628002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000628029) 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, 52091 + ... + 68663.

It is an arithmetic number, because the mean of its divisors is an integer number (126169575).

Almost surely, 2^1000628021 is an apocalyptic number.

It is an amenable number.

1000628021 is a deficient number, since it is larger than the sum of its proper divisors (8728579).

1000628021 is a wasteful number, since it uses less digits than its factorization.

1000628021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17095.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1000628021 is about 31632.7049270213. The cubic root of 1000628021 is about 1000.2092965252.

Adding to 1000628021 its reverse (1208260001), we get a palindrome (2208888022).

The spelling of 1000628021 in words is "one billion, six hundred twenty-eight thousand, twenty-one".