221403120 has 40 divisors (see below), whose sum is σ = 686350416. Its totient is φ = 59040768.

The previous prime is 221403113. The next prime is 221403137. The reversal of 221403120 is 21304122.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221403120.

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, 461017 + ... + 461496.

Almost surely, 2^221403120 is an apocalyptic number.

221403120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221403120 is an abundant number, since it is smaller than the sum of its proper divisors (464947296).

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

221403120 is a wasteful number, since it uses less digits than its factorization.

221403120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922529 (or 922523 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221403120 is about 14879.6209629143. The cubic root of 221403120 is about 604.9617442741.

Adding to 221403120 its reverse (21304122), we get a palindrome (242707242).

The spelling of 221403120 in words is "two hundred twenty-one million, four hundred three thousand, one hundred twenty".