213443444100221 has 16 divisors (see below), whose sum is σ = 230161536474240. Its totient is φ = 197273958382080.

The previous prime is 213443444100197. The next prime is 213443444100239. The reversal of 213443444100221 is 122001444344312.

It is a cyclic number.

It is not a de Polignac number, because 213443444100221 - 2⁴² = 209045397589117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213443444100521) 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, 39688376 + ... + 44744318.

It is an arithmetic number, because the mean of its divisors is an integer number (14385096029640).

Almost surely, 2^{213443444100221} is an apocalyptic number.

It is an amenable number.

213443444100221 is a deficient number, since it is larger than the sum of its proper divisors (16718092374019).

213443444100221 is a wasteful number, since it uses less digits than its factorization.

213443444100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5110196.

The product of its (nonzero) digits is 73728, while the sum is 35.

Adding to 213443444100221 its reverse (122001444344312), we get a palindrome (335444888444533).

The spelling of 213443444100221 in words is "two hundred thirteen trillion, four hundred forty-three billion, four hundred forty-four million, one hundred thousand, two hundred twenty-one".