1344722021 has 4 divisors (see below), whose sum is σ = 1345243212. Its totient is φ = 1344200832.

The previous prime is 1344722011. The next prime is 1344722023. The reversal of 1344722021 is 1202274431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 365344996 + 979377025 = 19114^2 + 31295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1344722021 - 2⁶ = 1344721957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1344722023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256706 + ... + 261891.

It is an arithmetic number, because the mean of its divisors is an integer number (336310803).

Almost surely, 2^1344722021 is an apocalyptic number.

It is an amenable number.

1344722021 is a deficient number, since it is larger than the sum of its proper divisors (521191).

1344722021 is an equidigital number, since it uses as much as digits as its factorization.

1344722021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521190.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 1344722021 is about 36670.4516061638. The cubic root of 1344722021 is about 1103.7672543408.

Adding to 1344722021 its reverse (1202274431), we get a palindrome (2546996452).

The spelling of 1344722021 in words is "one billion, three hundred forty-four million, seven hundred twenty-two thousand, twenty-one".