1420241521 has 4 divisors (see below), whose sum is σ = 1420903332. Its totient is φ = 1419579712.

The previous prime is 1420241519. The next prime is 1420241527. The reversal of 1420241521 is 1251420241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1251420241 = 877 ⋅1426933.

It can be written as a sum of positive squares in 2 ways, for example, as 828000625 + 592240896 = 28775^2 + 24336^2 .

It is a cyclic number.

It is not a de Polignac number, because 1420241521 - 2¹ = 1420241519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1420241492 and 1420241501.

It is not an unprimeable number, because it can be changed into a prime (1420241527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327676 + ... + 331981.

It is an arithmetic number, because the mean of its divisors is an integer number (355225833).

Almost surely, 2^1420241521 is an apocalyptic number.

It is an amenable number.

1420241521 is a deficient number, since it is larger than the sum of its proper divisors (661811).

1420241521 is an equidigital number, since it uses as much as digits as its factorization.

1420241521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661810.

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

The square root of 1420241521 is about 37686.0918775083. The cubic root of 1420241521 is about 1124.0545857429.

Adding to 1420241521 its reverse (1251420241), we get a palindrome (2671661762).

The spelling of 1420241521 in words is "one billion, four hundred twenty million, two hundred forty-one thousand, five hundred twenty-one".