1553003421 has 4 divisors (see below), whose sum is σ = 2070671232. Its totient is φ = 1035335612.

The previous prime is 1553003411. The next prime is 1553003423. The reversal of 1553003421 is 1243003551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1553003421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1553003391 and 1553003400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553003423) 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, 258833901 + ... + 258833906.

It is an arithmetic number, because the mean of its divisors is an integer number (517667808).

Almost surely, 2^1553003421 is an apocalyptic number.

It is an amenable number.

1553003421 is a deficient number, since it is larger than the sum of its proper divisors (517667811).

1553003421 is an equidigital number, since it uses as much as digits as its factorization.

1553003421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517667810.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1553003421 is about 39408.1643952113. The cubic root of 1553003421 is about 1158.0415380293.

Adding to 1553003421 its reverse (1243003551), we get a palindrome (2796006972).

The spelling of 1553003421 in words is "one billion, five hundred fifty-three million, three thousand, four hundred twenty-one".