1340127421 has 2 divisors, whose sum is σ = 1340127422. Its totient is φ = 1340127420.

The previous prime is 1340127413. The next prime is 1340127463. The reversal of 1340127421 is 1247210431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1255284900 + 84842521 = 35430^2 + 9211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340127421 - 2³ = 1340127413 is a prime.

It is a super-2 number, since 2×1340127421² = 3591883009032222482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340127721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670063710 + 670063711.

It is an arithmetic number, because the mean of its divisors is an integer number (670063711).

Almost surely, 2^1340127421 is an apocalyptic number.

It is an amenable number.

1340127421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340127421 is an equidigital number, since it uses as much as digits as its factorization.

1340127421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1340127421 is about 36607.7508323033. The cubic root of 1340127421 is about 1102.5087151955.

Adding to 1340127421 its reverse (1247210431), we get a palindrome (2587337852).

The spelling of 1340127421 in words is "one billion, three hundred forty million, one hundred twenty-seven thousand, four hundred twenty-one".