221010210021 has 16 divisors (see below), whose sum is σ = 295030471680. Its totient is φ = 147165150720.

The previous prime is 221010210019. The next prime is 221010210073. The reversal of 221010210021 is 120012010122.

It is not a de Polignac number, because 221010210021 - 2¹ = 221010210019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221010209979 and 221010210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221010211021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9613981 + ... + 9636941.

It is an arithmetic number, because the mean of its divisors is an integer number (18439404480).

Almost surely, 2^221010210021 is an apocalyptic number.

It is an amenable number.

221010210021 is a deficient number, since it is larger than the sum of its proper divisors (74020261659).

221010210021 is a wasteful number, since it uses less digits than its factorization.

221010210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26636.

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

Adding to 221010210021 its reverse (120012010122), we get a palindrome (341022220143).

The spelling of 221010210021 in words is "two hundred twenty-one billion, ten million, two hundred ten thousand, twenty-one".