221021221101001 has 4 divisors (see below), whose sum is σ = 221169856758912. Its totient is φ = 220872585443092.

The previous prime is 221021221100987. The next prime is 221021221101059. The reversal of 221021221101001 is 100101122120122.

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 221021221101001 - 2⁴³ = 212225128078793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021221101601) 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, 74317826725 + ... + 74317829698.

It is an arithmetic number, because the mean of its divisors is an integer number (55292464189728).

Almost surely, 2^{221021221101001} is an apocalyptic number.

It is an amenable number.

221021221101001 is a deficient number, since it is larger than the sum of its proper divisors (148635657911).

221021221101001 is a wasteful number, since it uses less digits than its factorization.

221021221101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148635657910.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221021221101001 its reverse (100101122120122), we get a palindrome (321122343221123).

The spelling of 221021221101001 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, one hundred one thousand, one".