221421301420 has 48 divisors (see below), whose sum is σ = 508252903200. Its totient is φ = 80358609920.

The previous prime is 221421301403. The next prime is 221421301457. The reversal of 221421301420 is 24103124122.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 221421301391 and 221421301400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 876685 + ... + 1100644.

It is an arithmetic number, because the mean of its divisors is an integer number (10588602150).

Almost surely, 2^221421301420 is an apocalyptic number.

221421301420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221421301420 is an abundant number, since it is smaller than the sum of its proper divisors (286831601780).

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

221421301420 is a wasteful number, since it uses less digits than its factorization.

221421301420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977858 (or 1977856 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 221421301420 its reverse (24103124122), we get a palindrome (245524425542).

The spelling of 221421301420 in words is "two hundred twenty-one billion, four hundred twenty-one million, three hundred one thousand, four hundred twenty".