1340791221 has 32 divisors (see below), whose sum is σ = 2346163200. Its totient is φ = 659854080.

The previous prime is 1340791211. The next prime is 1340791223. The reversal of 1340791221 is 1221970431.

It is not a de Polignac number, because 1340791221 - 2¹⁵ = 1340758453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340791223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148356 + ... + 157133.

It is an arithmetic number, because the mean of its divisors is an integer number (73317600).

Almost surely, 2^1340791221 is an apocalyptic number.

1340791221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1340791221 is a deficient number, since it is larger than the sum of its proper divisors (1005371979).

1340791221 is a wasteful number, since it uses less digits than its factorization.

1340791221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305529.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1340791221 is about 36616.8160958869. The cubic root of 1340791221 is about 1102.6907189047.

The spelling of 1340791221 in words is "one billion, three hundred forty million, seven hundred ninety-one thousand, two hundred twenty-one".