1403420021 has 2 divisors, whose sum is σ = 1403420022. Its totient is φ = 1403420020.

The previous prime is 1403419999. The next prime is 1403420099. The reversal of 1403420021 is 1200243041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817102225 + 586317796 = 28585^2 + 24214^2 .

It is an emirp because it is prime and its reverse (1200243041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1403420021 - 2²² = 1399225717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1403429021) 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 as a sum of consecutive naturals, namely, 701710010 + 701710011.

It is an arithmetic number, because the mean of its divisors is an integer number (701710011).

Almost surely, 2^1403420021 is an apocalyptic number.

It is an amenable number.

1403420021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1403420021 is an equidigital number, since it uses as much as digits as its factorization.

1403420021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1403420021 is about 37462.2479437633. The cubic root of 1403420021 is about 1119.5991393358.

Adding to 1403420021 its reverse (1200243041), we get a palindrome (2603663062).

The spelling of 1403420021 in words is "one billion, four hundred three million, four hundred twenty thousand, twenty-one".