221212221201001 has 4 divisors (see below), whose sum is σ = 221789798802432. Its totient is φ = 220634643599572.

The previous prime is 221212221200963. The next prime is 221212221201043. The reversal of 221212221201001 is 100102122212122.

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 221212221201001 - 2⁴⁷ = 80474732845673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221212221201001.

It is not an unprimeable number, because it can be changed into a prime (221212221201701) 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, 288788800141 + ... + 288788800906.

It is an arithmetic number, because the mean of its divisors is an integer number (55447449700608).

Almost surely, 2^{221212221201001} is an apocalyptic number.

It is an amenable number.

221212221201001 is a deficient number, since it is larger than the sum of its proper divisors (577577601431).

221212221201001 is an equidigital number, since it uses as much as digits as its factorization.

221212221201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577577601430.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221212221201001 its reverse (100102122212122), we get a palindrome (321314343413123).

The spelling of 221212221201001 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred one thousand, one".