221000101021 has 16 divisors (see below), whose sum is σ = 253210350976. Its totient is φ = 188950081536.

The previous prime is 221000101001. The next prime is 221000101037. The reversal of 221000101021 is 120101000122.

It is a cyclic number.

It is not a de Polignac number, because 221000101021 - 2¹¹ = 221000098973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221000100989 and 221000101007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000101001) 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, 5217490 + ... + 5259676.

It is an arithmetic number, because the mean of its divisors is an integer number (15825646936).

Almost surely, 2^221000101021 is an apocalyptic number.

It is an amenable number.

221000101021 is a deficient number, since it is larger than the sum of its proper divisors (32210249955).

221000101021 is a wasteful number, since it uses less digits than its factorization.

221000101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44068.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 221000101021 its reverse (120101000122), we get a palindrome (341101101143).

The spelling of 221000101021 in words is "two hundred twenty-one billion, one hundred one thousand, twenty-one".