221335123420 has 24 divisors (see below), whose sum is σ = 465638259744. Its totient is φ = 88375096896.

The previous prime is 221335123409. The next prime is 221335123447. The reversal of 221335123420 is 24321533122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9923112 + ... + 9945391.

It is an arithmetic number, because the mean of its divisors is an integer number (19401594156).

Almost surely, 2^221335123420 is an apocalyptic number.

221335123420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221335123420 is an abundant number, since it is smaller than the sum of its proper divisors (244303136324).

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

221335123420 is a wasteful number, since it uses less digits than its factorization.

221335123420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19869069 (or 19869067 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 221335123420 its reverse (24321533122), we get a palindrome (245656656542).

The spelling of 221335123420 in words is "two hundred twenty-one billion, three hundred thirty-five million, one hundred twenty-three thousand, four hundred twenty".