221120903420 has 24 divisors (see below), whose sum is σ = 465167150448. Its totient is φ = 88293456000.

The previous prime is 221120903389. The next prime is 221120903483. The reversal of 221120903420 is 24309021122.

It is a self number, because there is not a number n which added to its sum of digits gives 221120903420.

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, 9669881 + ... + 9692720.

It is an arithmetic number, because the mean of its divisors is an integer number (19381964602).

Almost surely, 2^221120903420 is an apocalyptic number.

221120903420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221120903420 is an abundant number, since it is smaller than the sum of its proper divisors (244046247028).

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

221120903420 is a wasteful number, since it uses less digits than its factorization.

221120903420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19363181 (or 19363179 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 221120903420 its reverse (24309021122), we get a palindrome (245429924542).

The spelling of 221120903420 in words is "two hundred twenty-one billion, one hundred twenty million, nine hundred three thousand, four hundred twenty".