1426550821 has 4 divisors (see below), whose sum is σ = 1426850944. Its totient is φ = 1426250700.

The previous prime is 1426550791. The next prime is 1426550849. The reversal of 1426550821 is 1280556241.

It is a happy number.

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: 1280556241 = 1747 ⋅733003.

It is a cyclic number.

It is not a de Polignac number, because 1426550821 - 2⁵ = 1426550789 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 (1426550221) 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, 142815 + ... + 152476.

It is an arithmetic number, because the mean of its divisors is an integer number (356712736).

Almost surely, 2^1426550821 is an apocalyptic number.

It is an amenable number.

1426550821 is a deficient number, since it is larger than the sum of its proper divisors (300123).

1426550821 is an equidigital number, since it uses as much as digits as its factorization.

1426550821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300122.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 1426550821 is about 37769.7077166345. The cubic root of 1426550821 is about 1125.7166320624.

The spelling of 1426550821 in words is "one billion, four hundred twenty-six million, five hundred fifty thousand, eight hundred twenty-one".