1020200021 has 8 divisors (see below), whose sum is σ = 1040117760. Its totient is φ = 1000307152.

The previous prime is 1020199979. The next prime is 1020200023. The reversal of 1020200021 is 1200020201.

1020200021 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 cyclic number.

It is not a de Polignac number, because 1020200021 - 2¹⁰ = 1020198997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020199981 and 1020200008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020200023) 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, 91340 + ... + 101898.

It is an arithmetic number, because the mean of its divisors is an integer number (130014720).

Almost surely, 2^1020200021 is an apocalyptic number.

It is an amenable number.

1020200021 is a deficient number, since it is larger than the sum of its proper divisors (19917739).

1020200021 is a wasteful number, since it uses less digits than its factorization.

1020200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12435.

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

The square root of 1020200021 is about 31940.5701420623. The cubic root of 1020200021 is about 1006.6885045017.

Adding to 1020200021 its reverse (1200020201), we get a palindrome (2220220222).

The spelling of 1020200021 in words is "one billion, twenty million, two hundred thousand, twenty-one".