10000000021021 has 4 divisors (see below), whose sum is σ = 10000043840700. Its totient is φ = 9999956201344.

The previous prime is 10000000020979. The next prime is 10000000021051. The reversal of 10000000021021 is 12012000000001.

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 5491809458521 + 4508190562500 = 2343461^2 + 2123250^2 .

It is a cyclic number.

It is not a de Polignac number, because 10000000021021 - 2⁹ = 10000000020509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10000000020995 and 10000000021013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000000021051) 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, 21565726 + ... + 22024543.

It is an arithmetic number, because the mean of its divisors is an integer number (2500010960175).

Almost surely, 2^{10000000021021} is an apocalyptic number.

It is an amenable number.

10000000021021 is a deficient number, since it is larger than the sum of its proper divisors (43819679).

10000000021021 is an equidigital number, since it uses as much as digits as its factorization.

10000000021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43819678.

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

Adding to 10000000021021 its reverse (12012000000001), we get a palindrome (22012000021022).

The spelling of 10000000021021 in words is "ten trillion, twenty-one thousand, twenty-one".