10121003021 has 4 divisors (see below), whose sum is σ = 10259646972. Its totient is φ = 9982359072.

The previous prime is 10121003003. The next prime is 10121003071. The reversal of 10121003021 is 12030012101.

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 5576355625 + 4544647396 = 74675^2 + 67414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10121003021 is a prime.

It is a super-2 number, since 2×10121003021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10121002993 and 10121003011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121003071) 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, 69321866 + ... + 69322011.

It is an arithmetic number, because the mean of its divisors is an integer number (2564911743).

Almost surely, 2^10121003021 is an apocalyptic number.

It is an amenable number.

10121003021 is a deficient number, since it is larger than the sum of its proper divisors (138643951).

10121003021 is an equidigital number, since it uses as much as digits as its factorization.

10121003021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138643950.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 10121003021 its reverse (12030012101), we get a palindrome (22151015122).

The spelling of 10121003021 in words is "ten billion, one hundred twenty-one million, three thousand, twenty-one".