2003021421 has 16 divisors (see below), whose sum is σ = 2787462720. Its totient is φ = 1278193280.

The previous prime is 2003021417. The next prime is 2003021431. The reversal of 2003021421 is 1241203002.

It is a cyclic number.

It is not a de Polignac number, because 2003021421 - 2² = 2003021417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2003021421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003021411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147111 + ... + 160148.

It is an arithmetic number, because the mean of its divisors is an integer number (174216420).

Almost surely, 2^2003021421 is an apocalyptic number.

It is an amenable number.

2003021421 is a deficient number, since it is larger than the sum of its proper divisors (784441299).

2003021421 is a wasteful number, since it uses less digits than its factorization.

2003021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307356.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2003021421 is about 44755.1273152027. The cubic root of 2003021421 is about 1260.5551893214. Note that the first 3 decimals are identical.

Adding to 2003021421 its reverse (1241203002), we get a palindrome (3244224423).

The spelling of 2003021421 in words is "two billion, three million, twenty-one thousand, four hundred twenty-one".