221212420013201 has 4 divisors (see below), whose sum is σ = 221212467486900. Its totient is φ = 221212372539504.

The previous prime is 221212420013077. The next prime is 221212420013227. The reversal of 221212420013201 is 102310024212122.

221212420013201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 85378616403025 + 135833803610176 = 9240055^2 + 11654776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221212420013201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212420033201) 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, 15880586 + ... + 26355603.

It is an arithmetic number, because the mean of its divisors is an integer number (55303116871725).

Almost surely, 2^{221212420013201} is an apocalyptic number.

It is an amenable number.

221212420013201 is a deficient number, since it is larger than the sum of its proper divisors (47473699).

221212420013201 is an equidigital number, since it uses as much as digits as its factorization.

221212420013201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47473698.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 221212420013201 its reverse (102310024212122), we get a palindrome (323522444225323).

The spelling of 221212420013201 in words is "two hundred twenty-one trillion, two hundred twelve billion, four hundred twenty million, thirteen thousand, two hundred one".