10203002021 has 4 divisors (see below), whose sum is σ = 10215614700. Its totient is φ = 10190389344.

The previous prime is 10203001999. The next prime is 10203002039. The reversal of 10203002021 is 12020030201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12020030201 = 102299 ⋅117499.

It can be written as a sum of positive squares in 2 ways, for example, as 5225699521 + 4977302500 = 72289^2 + 70550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10203002021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10203001993 and 10203002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10203052021) 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, 6305126 + ... + 6306743.

It is an arithmetic number, because the mean of its divisors is an integer number (2553903675).

Almost surely, 2^10203002021 is an apocalyptic number.

It is an amenable number.

10203002021 is a deficient number, since it is larger than the sum of its proper divisors (12612679).

10203002021 is an equidigital number, since it uses as much as digits as its factorization.

10203002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12612678.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 10203002021 its reverse (12020030201), we get a palindrome (22223032222).

The spelling of 10203002021 in words is "ten billion, two hundred three million, two thousand, twenty-one".