221120021001001 has 4 divisors (see below), whose sum is σ = 221120530826112. Its totient is φ = 221119511175892.

The previous prime is 221120021000969. The next prime is 221120021001017. The reversal of 221120021001001 is 100100120021122.

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 221120021001001 - 2⁵ = 221120021000969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221120021001301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254261425 + ... + 255129598.

It is an arithmetic number, because the mean of its divisors is an integer number (55280132706528).

Almost surely, 2^{221120021001001} is an apocalyptic number.

It is an amenable number.

221120021001001 is a deficient number, since it is larger than the sum of its proper divisors (509825111).

221120021001001 is an equidigital number, since it uses as much as digits as its factorization.

221120021001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509825110.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221120021001001 its reverse (100100120021122), we get a palindrome (321220141022123).

The spelling of 221120021001001 in words is "two hundred twenty-one trillion, one hundred twenty billion, twenty-one million, one thousand, one".