213244221421 has 32 divisors (see below), whose sum is σ = 269524620288. Its totient is φ = 163882602240.

The previous prime is 213244221419. The next prime is 213244221439. The reversal of 213244221421 is 124122442312.

It is not a de Polignac number, because 213244221421 - 2¹ = 213244221419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213244221421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213244225421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3761730 + ... + 3817996.

It is an arithmetic number, because the mean of its divisors is an integer number (8422644384).

Almost surely, 2^213244221421 is an apocalyptic number.

It is an amenable number.

213244221421 is a deficient number, since it is larger than the sum of its proper divisors (56280398867).

213244221421 is a wasteful number, since it uses less digits than its factorization.

213244221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56961.

The product of its digits is 6144, while the sum is 28.

Adding to 213244221421 its reverse (124122442312), we get a palindrome (337366663733).

The spelling of 213244221421 in words is "two hundred thirteen billion, two hundred forty-four million, two hundred twenty-one thousand, four hundred twenty-one".