221234424420 has 24 divisors (see below), whose sum is σ = 619456388544. Its totient is φ = 58995846496.

The previous prime is 221234424409. The next prime is 221234424427. The reversal of 221234424420 is 24424432122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (221234424427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1843620144 + ... + 1843620263.

It is an arithmetic number, because the mean of its divisors is an integer number (25810682856).

Almost surely, 2^221234424420 is an apocalyptic number.

221234424420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221234424420 is an abundant number, since it is smaller than the sum of its proper divisors (398221964124).

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

221234424420 is a wasteful number, since it uses less digits than its factorization.

221234424420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3687240419 (or 3687240417 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 221234424420 its reverse (24424432122), we get a palindrome (245658856542).

The spelling of 221234424420 in words is "two hundred twenty-one billion, two hundred thirty-four million, four hundred twenty-four thousand, four hundred twenty".