10221212021 has 8 divisors (see below), whose sum is σ = 10454600664. Its totient is φ = 9989324800.

The previous prime is 10221212017. The next prime is 10221212041. The reversal of 10221212021 is 12021212201.

10221212021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4948419025 + 5272792996 = 70345^2 + 72614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10221212021 - 2² = 10221212017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10221211987 and 10221212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221212011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361580 + ... + 388821.

It is an arithmetic number, because the mean of its divisors is an integer number (1306825083).

Almost surely, 2^10221212021 is an apocalyptic number.

It is an amenable number.

10221212021 is a deficient number, since it is larger than the sum of its proper divisors (233388643).

10221212021 is an equidigital number, since it uses as much as digits as its factorization.

10221212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750711.

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

Adding to 10221212021 its reverse (12021212201), we get a palindrome (22242424222).

The spelling of 10221212021 in words is "ten billion, two hundred twenty-one million, two hundred twelve thousand, twenty-one".