2221221100021 has 16 divisors (see below), whose sum is σ = 2769963124608. Its totient is φ = 1730416320000.

The previous prime is 2221221099997. The next prime is 2221221100039. The reversal of 2221221100021 is 1200011221222.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2221221100021 - 2¹³ = 2221221091829 is a prime.

It is a super-4 number, since 4×2221221100021⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221221099968 and 2221221100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221221110021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3046480 + ... + 3704521.

It is an arithmetic number, because the mean of its divisors is an integer number (173122695288).

Almost surely, 2^{2221221100021} is an apocalyptic number.

It is an amenable number.

2221221100021 is a deficient number, since it is larger than the sum of its proper divisors (548742024587).

2221221100021 is a wasteful number, since it uses less digits than its factorization.

2221221100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6755292.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2221221100021 its reverse (1200011221222), we get a palindrome (3421232321243).

The spelling of 2221221100021 in words is "two trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, twenty-one".