1421320551 has 8 divisors (see below), whose sum is σ = 2165821824. Its totient is φ = 812183160.

The previous prime is 1421320543. The next prime is 1421320573. The reversal of 1421320551 is 1550231241.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1421320551 - 2³ = 1421320543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421320531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33840945 + ... + 33840986.

It is an arithmetic number, because the mean of its divisors is an integer number (270727728).

Almost surely, 2^1421320551 is an apocalyptic number.

1421320551 is a deficient number, since it is larger than the sum of its proper divisors (744501273).

1421320551 is an equidigital number, since it uses as much as digits as its factorization.

1421320551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67681941.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1421320551 is about 37700.4051834990. The cubic root of 1421320551 is about 1124.3391809020.

Adding to 1421320551 its reverse (1550231241), we get a palindrome (2971551792).

The spelling of 1421320551 in words is "one billion, four hundred twenty-one million, three hundred twenty thousand, five hundred fifty-one".