10022021221 has 4 divisors (see below), whose sum is σ = 10022260492. Its totient is φ = 10021781952.

The previous prime is 10022021197. The next prime is 10022021239. The reversal of 10022021221 is 12212022001.

It is a happy number.

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 1738473025 + 8283548196 = 41695^2 + 91014^2 .

It is a cyclic number.

It is not a de Polignac number, because 10022021221 - 2¹⁵ = 10021988453 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 (10022021281) 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, 38436 + ... + 146701.

It is an arithmetic number, because the mean of its divisors is an integer number (2505565123).

Almost surely, 2^10022021221 is an apocalyptic number.

It is an amenable number.

10022021221 is a deficient number, since it is larger than the sum of its proper divisors (239271).

10022021221 is an equidigital number, since it uses as much as digits as its factorization.

10022021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239270.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 10022021221 its reverse (12212022001), we get a palindrome (22234043222).

The spelling of 10022021221 in words is "ten billion, twenty-two million, twenty-one thousand, two hundred twenty-one".