1421521055 has 4 divisors (see below), whose sum is σ = 1705825272. Its totient is φ = 1137216840.

The previous prime is 1421521051. The next prime is 1421521061. The reversal of 1421521055 is 5501251241.

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

It is not a de Polignac number, because 1421521055 - 2² = 1421521051 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 (1421521051) 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 3 ways as a sum of consecutive naturals, for example, 142152101 + ... + 142152110.

It is an arithmetic number, because the mean of its divisors is an integer number (426456318).

Almost surely, 2^1421521055 is an apocalyptic number.

1421521055 is a deficient number, since it is larger than the sum of its proper divisors (284304217).

1421521055 is an equidigital number, since it uses as much as digits as its factorization.

1421521055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284304216.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1421521055 is about 37703.0642653883. The cubic root of 1421521055 is about 1124.3920481465.

Adding to 1421521055 its reverse (5501251241), we get a palindrome (6922772296).

The spelling of 1421521055 in words is "one billion, four hundred twenty-one million, five hundred twenty-one thousand, fifty-five".