1240068221 has 4 divisors (see below), whose sum is σ = 1417220832. Its totient is φ = 1062915612.

The previous prime is 1240068199. The next prime is 1240068317. The reversal of 1240068221 is 1228600421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1228600421 = 17 ⋅72270613.

It is a cyclic number.

It is not a de Polignac number, because 1240068221 - 2⁶ = 1240068157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240068121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88576295 + ... + 88576308.

It is an arithmetic number, because the mean of its divisors is an integer number (354305208).

Almost surely, 2^1240068221 is an apocalyptic number.

It is an amenable number.

1240068221 is a deficient number, since it is larger than the sum of its proper divisors (177152611).

1240068221 is an equidigital number, since it uses as much as digits as its factorization.

1240068221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177152610.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 1240068221 is about 35214.6023831024. The cubic root of 1240068221 is about 1074.3567728721.

Adding to 1240068221 its reverse (1228600421), we get a palindrome (2468668642).

The spelling of 1240068221 in words is "one billion, two hundred forty million, sixty-eight thousand, two hundred twenty-one".