221211310013021 has 2 divisors, whose sum is σ = 221211310013022. Its totient is φ = 221211310013020.

The previous prime is 221211310013009. The next prime is 221211310013101. The reversal of 221211310013021 is 120310013112122.

221211310013021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148416473716900 + 72794836296121 = 12182630^2 + 8531989^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211310013021 - 2¹⁰ = 221211310011997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221211310012984 and 221211310013002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211310015021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605655006510 + 110605655006511.

It is an arithmetic number, because the mean of its divisors is an integer number (110605655006511).

Almost surely, 2^{221211310013021} is an apocalyptic number.

It is an amenable number.

221211310013021 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211310013021 is an equidigital number, since it uses as much as digits as its factorization.

221211310013021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 221211310013021 its reverse (120310013112122), we get a palindrome (341521323125143).

The spelling of 221211310013021 in words is "two hundred twenty-one trillion, two hundred eleven billion, three hundred ten million, thirteen thousand, twenty-one".