222121342440 has 144 divisors (see below), whose sum is σ = 766857000780. Its totient is φ = 55748075520.

The previous prime is 222121342393. The next prime is 222121342447. The reversal of 222121342440 is 44243121222.

It is a happy number.

222121342440 is a `hidden beast` number, since 2 + 2 + 2 + 1 + 213 + 4 + 2 + 440 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 89859654756 + 132261687684 = 299766^2 + 363678^2 .

It is not an unprimeable number, because it can be changed into a prime (222121342447) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 963441 + ... + 1171520.

Almost surely, 2^222121342440 is an apocalyptic number.

222121342440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222121342440 is an abundant number, since it is smaller than the sum of its proper divisors (544735658340).

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

222121342440 is a wasteful number, since it uses less digits than its factorization.

222121342440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135012 (or 2134988 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 222121342440 its reverse (44243121222), we get a palindrome (266364463662).

The spelling of 222121342440 in words is "two hundred twenty-two billion, one hundred twenty-one million, three hundred forty-two thousand, four hundred forty".