2221004021 has 4 divisors (see below), whose sum is σ = 2292649344. Its totient is φ = 2149358700.

The previous prime is 2221004017. The next prime is 2221004033. The reversal of 2221004021 is 1204001222.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1204001222 = 2 ⋅602000611.

It is a cyclic number.

It is not a de Polignac number, because 2221004021 - 2² = 2221004017 is a prime.

It is a super-2 number, since 2×2221004021² = 9865717722596336882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221003987 and 2221004005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221004081) 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, 35822615 + ... + 35822676.

It is an arithmetic number, because the mean of its divisors is an integer number (573162336).

Almost surely, 2^2221004021 is an apocalyptic number.

It is an amenable number.

2221004021 is a deficient number, since it is larger than the sum of its proper divisors (71645323).

2221004021 is an equidigital number, since it uses as much as digits as its factorization.

2221004021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71645322.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2221004021 is about 47127.5293326523. The cubic root of 2221004021 is about 1304.7173819762.

Adding to 2221004021 its reverse (1204001222), we get a palindrome (3425005243).

The spelling of 2221004021 in words is "two billion, two hundred twenty-one million, four thousand, twenty-one".