1421542021 has 2 divisors, whose sum is σ = 1421542022. Its totient is φ = 1421542020.

The previous prime is 1421541997. The next prime is 1421542027. The reversal of 1421542021 is 1202451241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 999444996 + 422097025 = 31614^2 + 20545^2 .

It is an emirp because it is prime and its reverse (1202451241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1421542021 - 2⁷ = 1421541893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1421541983 and 1421542001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421542027) 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 as a sum of consecutive naturals, namely, 710771010 + 710771011.

It is an arithmetic number, because the mean of its divisors is an integer number (710771011).

Almost surely, 2^1421542021 is an apocalyptic number.

It is an amenable number.

1421542021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421542021 is an equidigital number, since it uses as much as digits as its factorization.

1421542021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1421542021 is about 37703.3423054243. The cubic root of 1421542021 is about 1124.3975760017.

Adding to 1421542021 its reverse (1202451241), we get a palindrome (2623993262).

The spelling of 1421542021 in words is "one billion, four hundred twenty-one million, five hundred forty-two thousand, twenty-one".