10221002021 has 12 divisors (see below), whose sum is σ = 10930520100. Its totient is φ = 9555164160.

The previous prime is 10221001957. The next prime is 10221002081. The reversal of 10221002021 is 12020012201.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 974064100 + 9246937921 = 31210^2 + 96161^2 .

It is not a de Polignac number, because 10221002021 - 2⁶ = 10221001957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10221001993 and 10221002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221002081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75620 + ... + 161741.

It is an arithmetic number, because the mean of its divisors is an integer number (910876675).

Almost surely, 2^10221002021 is an apocalyptic number.

It is an amenable number.

10221002021 is a deficient number, since it is larger than the sum of its proper divisors (709518079).

10221002021 is a wasteful number, since it uses less digits than its factorization.

10221002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237544 (or 237527 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10221002021 its reverse (12020012201), we get a palindrome (22241014222).

The spelling of 10221002021 in words is "ten billion, two hundred twenty-one million, two thousand, twenty-one".