10002011021 has 4 divisors (see below), whose sum is σ = 10093772700. Its totient is φ = 9910249344.

The previous prime is 10002011003. The next prime is 10002011023. The reversal of 10002011021 is 12011020001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7941304996 + 2060706025 = 89114^2 + 45395^2 .

It is a cyclic number.

It is not a de Polignac number, because 10002011021 - 2⁶ = 10002010957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10002011023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45880676 + ... + 45880893.

It is an arithmetic number, because the mean of its divisors is an integer number (2523443175).

Almost surely, 2^10002011021 is an apocalyptic number.

It is an amenable number.

10002011021 is a deficient number, since it is larger than the sum of its proper divisors (91761679).

10002011021 is an equidigital number, since it uses as much as digits as its factorization.

10002011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91761678.

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

Adding to 10002011021 its reverse (12011020001), we get a palindrome (22013031022).

The spelling of 10002011021 in words is "ten billion, two million, eleven thousand, twenty-one".