221435040 has 48 divisors (see below), whose sum is σ = 697521888. Its totient is φ = 59049216.

The previous prime is 221435033. The next prime is 221435051. The reversal of 221435040 is 40534122.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 221434998 and 221435016.

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, 230182 + ... + 231141.

It is an arithmetic number, because the mean of its divisors is an integer number (14531706).

Almost surely, 2^221435040 is an apocalyptic number.

221435040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221435040 is an abundant number, since it is smaller than the sum of its proper divisors (476086848).

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

221435040 is a wasteful number, since it uses less digits than its factorization.

221435040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461341 (or 461333 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221435040 is about 14880.6935322249. The cubic root of 221435040 is about 604.9908156063.

Adding to 221435040 its reverse (40534122), we get a palindrome (261969162).

The spelling of 221435040 in words is "two hundred twenty-one million, four hundred thirty-five thousand, forty".