10022120021 has 4 divisors (see below), whose sum is σ = 10023032652. Its totient is φ = 10021207392.

The previous prime is 10022119997. The next prime is 10022120029. The reversal of 10022120021 is 12002122001.

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 6130107025 + 3892012996 = 78295^2 + 62386^2 .

It is a cyclic number.

It is not a de Polignac number, because 10022120021 - 2⁶ = 10022119957 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 = 10022119984 and 10022120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10022120029) 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, 439640 + ... + 461873.

It is an arithmetic number, because the mean of its divisors is an integer number (2505758163).

Almost surely, 2^10022120021 is an apocalyptic number.

It is an amenable number.

10022120021 is a deficient number, since it is larger than the sum of its proper divisors (912631).

10022120021 is an equidigital number, since it uses as much as digits as its factorization.

10022120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912630.

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

Adding to 10022120021 its reverse (12002122001), we get a palindrome (22024242022).

The spelling of 10022120021 in words is "ten billion, twenty-two million, one hundred twenty thousand, twenty-one".