213441311421 has 24 divisors (see below), whose sum is σ = 335065891160. Its totient is φ = 130143459456.

The previous prime is 213441311399. The next prime is 213441311459. The reversal of 213441311421 is 124113144312.

It is a happy number.

213441311421 is a `hidden beast` number, since 2 + 1 + 344 + 1 + 311 + 4 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1353430521 + 212087880900 = 36789^2 + 460530^2 .

It is not a de Polignac number, because 213441311421 - 2⁹ = 213441310909 is a prime.

It is a super-2 number, since 2×213441311421² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213441311491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8355526 + ... + 8381031.

Almost surely, 2^213441311421 is an apocalyptic number.

It is an amenable number.

213441311421 is a deficient number, since it is larger than the sum of its proper divisors (121624579739).

213441311421 is a wasteful number, since it uses less digits than its factorization.

213441311421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16736685 (or 16736682 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

Adding to 213441311421 its reverse (124113144312), we get a palindrome (337554455733).

The spelling of 213441311421 in words is "two hundred thirteen billion, four hundred forty-one million, three hundred eleven thousand, four hundred twenty-one".