221211044402424 has 96 divisors (see below), whose sum is σ = 583695716274000. Its totient is φ = 69852593793024.

The previous prime is 221211044402419. The next prime is 221211044402461. The reversal of 221211044402424 is 424204440112122.

It is a happy number.

221211044402424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221211044402424² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 173763442 + ... + 175031870.

Almost surely, 2^{221211044402424} is an apocalyptic number.

221211044402424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221211044402424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291847858137000).

221211044402424 is an abundant number, since it is smaller than the sum of its proper divisors (362484671871576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221211044402424 is a wasteful number, since it uses less digits than its factorization.

221211044402424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288605 (or 1288582 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 33.

Adding to 221211044402424 its reverse (424204440112122), we get a palindrome (645415484514546).

The spelling of 221211044402424 in words is "two hundred twenty-one trillion, two hundred eleven billion, forty-four million, four hundred two thousand, four hundred twenty-four".