1421303021 has 4 divisors (see below), whose sum is σ = 1470313500. Its totient is φ = 1372292544.

The previous prime is 1421303011. The next prime is 1421303083. The reversal of 1421303021 is 1203031241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1203031241 = 1877 ⋅640933.

It can be written as a sum of positive squares in 2 ways, for example, as 519201796 + 902101225 = 22786^2 + 30035^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421303021 - 2⁶ = 1421302957 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 (1421303011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24505196 + ... + 24505253.

It is an arithmetic number, because the mean of its divisors is an integer number (367578375).

Almost surely, 2^1421303021 is an apocalyptic number.

It is an amenable number.

1421303021 is a deficient number, since it is larger than the sum of its proper divisors (49010479).

1421303021 is an equidigital number, since it uses as much as digits as its factorization.

1421303021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49010478.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1421303021 is about 37700.1726919122. The cubic root of 1421303021 is about 1124.3345584995.

Adding to 1421303021 its reverse (1203031241), we get a palindrome (2624334262).

The spelling of 1421303021 in words is "one billion, four hundred twenty-one million, three hundred three thousand, twenty-one".