10000120021 has 4 divisors (see below), whose sum is σ = 10434907872. Its totient is φ = 9565332172.

The previous prime is 10000120019. The next prime is 10000120063. The reversal of 10000120021 is 12002100001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12002100001 = 53 ⋅226454717.

It is a cyclic number.

It is not a de Polignac number, because 10000120021 - 2¹ = 10000120019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10000119986 and 10000120013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000120421) 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, 217393891 + ... + 217393936.

It is an arithmetic number, because the mean of its divisors is an integer number (2608726968).

Almost surely, 2^10000120021 is an apocalyptic number.

It is an amenable number.

10000120021 is a deficient number, since it is larger than the sum of its proper divisors (434787851).

10000120021 is an equidigital number, since it uses as much as digits as its factorization.

10000120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434787850.

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

Adding to 10000120021 its reverse (12002100001), we get a palindrome (22002220022).

The spelling of 10000120021 in words is "ten billion, one hundred twenty thousand, twenty-one".