1002101021 has 4 divisors (see below), whose sum is σ = 1054843200. Its totient is φ = 949358844.

The previous prime is 1002101011. The next prime is 1002101041. The reversal of 1002101021 is 1201012001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1002101021 - 2¹⁰ = 1002099997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002101011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26371061 + ... + 26371098.

It is an arithmetic number, because the mean of its divisors is an integer number (263710800).

Almost surely, 2^1002101021 is an apocalyptic number.

It is an amenable number.

1002101021 is a deficient number, since it is larger than the sum of its proper divisors (52742179).

1002101021 is an equidigital number, since it uses as much as digits as its factorization.

1002101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52742178.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1002101021 is about 31655.9792298390. The cubic root of 1002101021 is about 1000.6998504285.

Adding to 1002101021 its reverse (1201012001), we get a palindrome (2203113022).

The spelling of 1002101021 in words is "one billion, two million, one hundred one thousand, twenty-one".