2221221212021 has 8 divisors (see below), whose sum is σ = 2551691578944. Its totient is φ = 1894039107840.

The previous prime is 2221221212011. The next prime is 2221221212029. The reversal of 2221221212021 is 1202121221222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2221221212021 - 2¹⁰ = 2221221210997 is a prime.

It is a super-4 number, since 4×2221221212021⁴ (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 = 2221221211984 and 2221221212002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221221212029) 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, 822064235 + ... + 822066936.

It is an arithmetic number, because the mean of its divisors is an integer number (318961447368).

Almost surely, 2^{2221221212021} is an apocalyptic number.

It is an amenable number.

2221221212021 is a deficient number, since it is larger than the sum of its proper divisors (330470366923).

2221221212021 is a wasteful number, since it uses less digits than its factorization.

2221221212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644131371.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2221221212021 its reverse (1202121221222), we get a palindrome (3423342433243).

The spelling of 2221221212021 in words is "two trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, twenty-one".