2400021421 has 8 divisors (see below), whose sum is σ = 2798859200. Its totient is φ = 2057160924.

The previous prime is 2400021409. The next prime is 2400021473. The reversal of 2400021421 is 1241200042.

It is not a de Polignac number, because 2400021421 - 2¹¹ = 2400019373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2400021395 and 2400021404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2400001421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3498231 + ... + 3498916.

It is an arithmetic number, because the mean of its divisors is an integer number (349857400).

Almost surely, 2^2400021421 is an apocalyptic number.

It is an amenable number.

2400021421 is a deficient number, since it is larger than the sum of its proper divisors (398837779).

2400021421 is an frugal number, since it uses more digits than its factorization.

2400021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6997168 (or 6997154 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2400021421 is about 48990.0134823415. The cubic root of 2400021421 is about 1338.8698834645.

Adding to 2400021421 its reverse (1241200042), we get a palindrome (3641221463).

The spelling of 2400021421 in words is "two billion, four hundred million, twenty-one thousand, four hundred twenty-one".