221035245240 has 128 divisors (see below), whose sum is σ = 700723872000. Its totient is φ = 55623057408.

The previous prime is 221035245229. The next prime is 221035245247. The reversal of 221035245240 is 42542530122.

221035245240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 221035245198 and 221035245207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221035245247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397351 + ... + 774569.

It is an arithmetic number, because the mean of its divisors is an integer number (5474405250).

Almost surely, 2^221035245240 is an apocalyptic number.

221035245240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221035245240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350361936000).

221035245240 is an abundant number, since it is smaller than the sum of its proper divisors (479688626760).

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

221035245240 is a wasteful number, since it uses less digits than its factorization.

221035245240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377509 (or 377505 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 221035245240 its reverse (42542530122), we get a palindrome (263577775362).

The spelling of 221035245240 in words is "two hundred twenty-one billion, thirty-five million, two hundred forty-five thousand, two hundred forty".