10021221021 has 64 divisors (see below), whose sum is σ = 15886540800. Its totient is φ = 5501523456.

The previous prime is 10021221017. The next prime is 10021221031. The reversal of 10021221021 is 12012212001.

It is not a de Polignac number, because 10021221021 - 2² = 10021221017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10021220988 and 10021221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021221031) 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 63 ways as a sum of consecutive naturals, for example, 9892111 + ... + 9893123.

It is an arithmetic number, because the mean of its divisors is an integer number (248227200).

Almost surely, 2^10021221021 is an apocalyptic number.

It is an amenable number.

10021221021 is a deficient number, since it is larger than the sum of its proper divisors (5865319779).

10021221021 is a wasteful number, since it uses less digits than its factorization.

10021221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 10021221021 its reverse (12012212001), we get a palindrome (22033433022).

The spelling of 10021221021 in words is "ten billion, twenty-one million, two hundred twenty-one thousand, twenty-one".