1340240221 has 8 divisors (see below), whose sum is σ = 1414001600. Its totient is φ = 1266801120.

The previous prime is 1340240201. The next prime is 1340240227. The reversal of 1340240221 is 1220420431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1340240221 - 2⁵ = 1340240189 is a prime.

It is a super-2 number, since 2×1340240221² = 3592487699972257682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340240227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72000 + ... + 88681.

It is an arithmetic number, because the mean of its divisors is an integer number (176750200).

Almost surely, 2^1340240221 is an apocalyptic number.

It is an amenable number.

1340240221 is a deficient number, since it is larger than the sum of its proper divisors (73761379).

1340240221 is a wasteful number, since it uses less digits than its factorization.

1340240221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161139.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1340240221 is about 36609.2914572244. The cubic root of 1340240221 is about 1102.5396474516.

Adding to 1340240221 its reverse (1220420431), we get a palindrome (2560660652).

The spelling of 1340240221 in words is "one billion, three hundred forty million, two hundred forty thousand, two hundred twenty-one".