221222212221001 has 4 divisors (see below), whose sum is σ = 230840569274112. Its totient is φ = 211603855167892.

The previous prime is 221222212220941. The next prime is 221222212221007. The reversal of 221222212221001 is 100122212222122.

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.

It is a cyclic number.

It is not a de Polignac number, because 221222212221001 - 2⁹ = 221222212220489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221222212221007) 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, 4809178526521 + ... + 4809178526566.

It is an arithmetic number, because the mean of its divisors is an integer number (57710142318528).

Almost surely, 2^{221222212221001} is an apocalyptic number.

It is an amenable number.

221222212221001 is a deficient number, since it is larger than the sum of its proper divisors (9618357053111).

221222212221001 is an equidigital number, since it uses as much as digits as its factorization.

221222212221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9618357053110.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221222212221001 its reverse (100122212222122), we get a palindrome (321344424443123).

The spelling of 221222212221001 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, two hundred twenty-one thousand, one".