10012421021 has 4 divisors (see below), whose sum is σ = 10021549212. Its totient is φ = 10003292832.

The previous prime is 10012420993. The next prime is 10012421059. The reversal of 10012421021 is 12012421001.

It is a happy number.

10012421021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7281208900 + 2731212121 = 85330^2 + 52261^2 .

It is a cyclic number.

It is not a de Polignac number, because 10012421021 - 2¹⁴ = 10012404637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10012420987 and 10012421005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10012421921) 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, 4562450 + ... + 4564643.

It is an arithmetic number, because the mean of its divisors is an integer number (2505387303).

Almost surely, 2^10012421021 is an apocalyptic number.

It is an amenable number.

10012421021 is a deficient number, since it is larger than the sum of its proper divisors (9128191).

10012421021 is an equidigital number, since it uses as much as digits as its factorization.

10012421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9128190.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10012421021 its reverse (12012421001), we get a palindrome (22024842022).

The spelling of 10012421021 in words is "ten billion, twelve million, four hundred twenty-one thousand, twenty-one".