2421400221 has 12 divisors (see below), whose sum is σ = 3499695420. Its totient is φ = 1613289600.

The previous prime is 2421400217. The next prime is 2421400237. The reversal of 2421400221 is 1220041242.

2421400221 is a `hidden beast` number, since 2 + 42 + 1 + 400 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2008294596 + 413105625 = 44814^2 + 20325^2 .

It is not a de Polignac number, because 2421400221 - 2² = 2421400217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2421400194 and 2421400203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421400021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65580 + ... + 95621.

It is an arithmetic number, because the mean of its divisors is an integer number (291641285).

Almost surely, 2^2421400221 is an apocalyptic number.

It is an amenable number.

2421400221 is a deficient number, since it is larger than the sum of its proper divisors (1078295199).

2421400221 is a wasteful number, since it uses less digits than its factorization.

2421400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162876 (or 162873 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 2421400221 is about 49207.7252166771. The cubic root of 2421400221 is about 1342.8335785616.

Adding to 2421400221 its reverse (1220041242), we get a palindrome (3641441463).

The spelling of 2421400221 in words is "two billion, four hundred twenty-one million, four hundred thousand, two hundred twenty-one".