221423241340 has 36 divisors (see below), whose sum is σ = 540905349096. Its totient is φ = 75916539552.

The previous prime is 221423241323. The next prime is 221423241349. The reversal of 221423241340 is 43142324122.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 221423241299 and 221423241308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221423241349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112970062 + ... + 112972021.

It is an arithmetic number, because the mean of its divisors is an integer number (15025148586).

Almost surely, 2^221423241340 is an apocalyptic number.

221423241340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221423241340 is an abundant number, since it is smaller than the sum of its proper divisors (319482107756).

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

221423241340 is a wasteful number, since it uses less digits than its factorization.

221423241340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225942106 (or 225942097 counting only the distinct ones).

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

Adding to 221423241340 its reverse (43142324122), we get a palindrome (264565565462).

The spelling of 221423241340 in words is "two hundred twenty-one billion, four hundred twenty-three million, two hundred forty-one thousand, three hundred forty".