1010200021 has 8 divisors (see below), whose sum is σ = 1017832640. Its totient is φ = 1002592512.

The previous prime is 1010199991. The next prime is 1010200049. The reversal of 1010200021 is 1200020101.

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 1010200021 - 2²⁵ = 976645589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1010199977 and 1010200013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010200091) 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, 78766 + ... + 90688.

It is an arithmetic number, because the mean of its divisors is an integer number (127229080).

Almost surely, 2^1010200021 is an apocalyptic number.

It is an amenable number.

1010200021 is a deficient number, since it is larger than the sum of its proper divisors (7632619).

1010200021 is a wasteful number, since it uses less digits than its factorization.

1010200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12555.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1010200021 is about 31783.6439226216. The cubic root of 1010200021 is about 1003.3885120173.

Adding to 1010200021 its reverse (1200020101), we get a palindrome (2210220122).

The spelling of 1010200021 in words is "one billion, ten million, two hundred thousand, twenty-one".