221202121221001 has 4 divisors (see below), whose sum is σ = 221204441480400. Its totient is φ = 221199800961604.

The previous prime is 221202121220999. The next prime is 221202121221017. The reversal of 221202121221001 is 100122121202122.

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 221202121221001 - 2¹ = 221202121220999 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 221202121221001.

It is not an unprimeable number, because it can be changed into a prime (221202121221031) 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, 1159986691 + ... + 1160177368.

It is an arithmetic number, because the mean of its divisors is an integer number (55301110370100).

Almost surely, 2^{221202121221001} is an apocalyptic number.

It is an amenable number.

221202121221001 is a deficient number, since it is larger than the sum of its proper divisors (2320259399).

221202121221001 is an equidigital number, since it uses as much as digits as its factorization.

221202121221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320259398.

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

Adding to 221202121221001 its reverse (100122121202122), we get a palindrome (321324242423123).

The spelling of 221202121221001 in words is "two hundred twenty-one trillion, two hundred two billion, one hundred twenty-one million, two hundred twenty-one thousand, one".