221424321340 has 24 divisors (see below), whose sum is σ = 465040527840. Its totient is φ = 88560308928.

The previous prime is 221424321319. The next prime is 221424321373. The reversal of 221424321340 is 43123424122.

It is a junction number, because it is equal to n+sod(n) for n = 221424321299 and 221424321308.

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, 394407 + ... + 773566.

It is an arithmetic number, because the mean of its divisors is an integer number (19376688660).

Almost surely, 2^221424321340 is an apocalyptic number.

221424321340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221424321340 is an abundant number, since it is smaller than the sum of its proper divisors (243616206500).

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

221424321340 is a wasteful number, since it uses less digits than its factorization.

221424321340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177461 (or 1177459 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 221424321340 its reverse (43123424122), we get a palindrome (264547745462).

The spelling of 221424321340 in words is "two hundred twenty-one billion, four hundred twenty-four million, three hundred twenty-one thousand, three hundred forty".