1340203021 has 2 divisors, whose sum is σ = 1340203022. Its totient is φ = 1340203020.

The previous prime is 1340202961. The next prime is 1340203043. The reversal of 1340203021 is 1203020431.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1179166921 + 161036100 = 34339^2 + 12690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340203021 - 2¹¹ = 1340200973 is a prime.

It is a super-2 number, since 2×1340203021² = 3592288274995052882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1340202986 and 1340203004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340203061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670101510 + 670101511.

It is an arithmetic number, because the mean of its divisors is an integer number (670101511).

Almost surely, 2^1340203021 is an apocalyptic number.

It is an amenable number.

1340203021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340203021 is an equidigital number, since it uses as much as digits as its factorization.

1340203021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1340203021 is about 36608.7833859581. The cubic root of 1340203021 is about 1102.5294465803.

Adding to 1340203021 its reverse (1203020431), we get a palindrome (2543223452).

The spelling of 1340203021 in words is "one billion, three hundred forty million, two hundred three thousand, twenty-one".