2003561421 has 4 divisors (see below), whose sum is σ = 2671415232. Its totient is φ = 1335707612.

The previous prime is 2003561407. The next prime is 2003561509. The reversal of 2003561421 is 1241653002.

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 not a de Polignac number, because 2003561421 - 2¹³ = 2003553229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2003561391 and 2003561400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003561821) 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, 333926901 + ... + 333926906.

It is an arithmetic number, because the mean of its divisors is an integer number (667853808).

Almost surely, 2^2003561421 is an apocalyptic number.

It is an amenable number.

2003561421 is a deficient number, since it is larger than the sum of its proper divisors (667853811).

2003561421 is an equidigital number, since it uses as much as digits as its factorization.

2003561421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667853810.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2003561421 is about 44761.1597369863. The cubic root of 2003561421 is about 1260.6684579787.

The spelling of 2003561421 in words is "two billion, three million, five hundred sixty-one thousand, four hundred twenty-one".