1357448021 has 4 divisors (see below), whose sum is σ = 1370627232. Its totient is φ = 1344268812.

The previous prime is 1357447999. The next prime is 1357448023. The reversal of 1357448021 is 1208447531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1208447531 = 23 ⋅52541197.

It is a cyclic number.

It is not a de Polignac number, because 1357448021 - 2³⁰ = 283706197 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 (1357448023) 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, 6589451 + ... + 6589656.

It is an arithmetic number, because the mean of its divisors is an integer number (342656808).

Almost surely, 2^1357448021 is an apocalyptic number.

It is an amenable number.

1357448021 is a deficient number, since it is larger than the sum of its proper divisors (13179211).

1357448021 is a wasteful number, since it uses less digits than its factorization.

1357448021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13179210.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 1357448021 is about 36843.5614592292. The cubic root of 1357448021 is about 1107.2382227574.

The spelling of 1357448021 in words is "one billion, three hundred fifty-seven million, four hundred forty-eight thousand, twenty-one".