2221002421 has 16 divisors (see below), whose sum is σ = 2449370880. Its totient is φ = 1997110080.

The previous prime is 2221002403. The next prime is 2221002463. The reversal of 2221002421 is 1242001222.

It is a cyclic number.

It is not a de Polignac number, because 2221002421 - 2²³ = 2212613813 is a prime.

It is a super-2 number, since 2×2221002421² = 9865703508175722482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2221002395 and 2221002404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221006421) 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, 906420 + ... + 908866.

It is an arithmetic number, because the mean of its divisors is an integer number (153085680).

Almost surely, 2^2221002421 is an apocalyptic number.

It is an amenable number.

2221002421 is a deficient number, since it is larger than the sum of its proper divisors (228368459).

2221002421 is a wasteful number, since it uses less digits than its factorization.

2221002421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324.

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

The square root of 2221002421 is about 47127.5123574330. The cubic root of 2221002421 is about 1304.7170686722.

Adding to 2221002421 its reverse (1242001222), we get a palindrome (3463003643).

The spelling of 2221002421 in words is "two billion, two hundred twenty-one million, two thousand, four hundred twenty-one".