10020021221 has 36 divisors (see below), whose sum is σ = 12753563724. Its totient is φ = 7821999360.

The previous prime is 10020021211. The next prime is 10020021233. The reversal of 10020021221 is 12212002001.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8706756100 + 1313265121 = 93310^2 + 36239^2 .

It is a de Polignac number, because none of the positive numbers 2^k-10020021221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020021211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 794255 + ... + 806771.

It is an arithmetic number, because the mean of its divisors is an integer number (354265659).

Almost surely, 2^10020021221 is an apocalyptic number.

It is an amenable number.

10020021221 is a deficient number, since it is larger than the sum of its proper divisors (2733542503).

10020021221 is a wasteful number, since it uses less digits than its factorization.

10020021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12610 (or 12572 counting only the distinct ones).

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

Adding to 10020021221 its reverse (12212002001), we get a palindrome (22232023222).

The spelling of 10020021221 in words is "ten billion, twenty million, twenty-one thousand, two hundred twenty-one".