1490521421 has 4 divisors (see below), whose sum is σ = 1526875644. Its totient is φ = 1454167200.

The previous prime is 1490521399. The next prime is 1490521423. The reversal of 1490521421 is 1241250941.

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

It can be written as a sum of positive squares in 2 ways, for example, as 294122500 + 1196398921 = 17150^2 + 34589^2 .

It is a cyclic number.

It is not a de Polignac number, because 1490521421 - 2¹⁰ = 1490520397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1490521423) 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, 18177050 + ... + 18177131.

It is an arithmetic number, because the mean of its divisors is an integer number (381718911).

Almost surely, 2^1490521421 is an apocalyptic number.

It is an amenable number.

1490521421 is a deficient number, since it is larger than the sum of its proper divisors (36354223).

1490521421 is an equidigital number, since it uses as much as digits as its factorization.

1490521421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36354222.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1490521421 is about 38607.2716078202. The cubic root of 1490521421 is about 1142.2979760163.

The spelling of 1490521421 in words is "one billion, four hundred ninety million, five hundred twenty-one thousand, four hundred twenty-one".