1340312421 has 64 divisors (see below), whose sum is σ = 2201937920. Its totient is φ = 708238080.

The previous prime is 1340312417. The next prime is 1340312423. The reversal of 1340312421 is 1242130431.

It is not a de Polignac number, because 1340312421 - 2² = 1340312417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340312423) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4838535 + ... + 4838811.

It is an arithmetic number, because the mean of its divisors is an integer number (34405280).

Almost surely, 2^1340312421 is an apocalyptic number.

It is an amenable number.

1340312421 is a deficient number, since it is larger than the sum of its proper divisors (861625499).

1340312421 is a wasteful number, since it uses less digits than its factorization.

1340312421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1340312421 is about 36610.2775324088. The cubic root of 1340312421 is about 1102.5594453784.

Adding to 1340312421 its reverse (1242130431), we get a palindrome (2582442852).

The spelling of 1340312421 in words is "one billion, three hundred forty million, three hundred twelve thousand, four hundred twenty-one".