221101323021 has 24 divisors (see below), whose sum is σ = 328929514680. Its totient is φ = 143010717696.

The previous prime is 221101323017. The next prime is 221101323097. The reversal of 221101323021 is 120323101122.

221101323021 is a `hidden beast` number, since 221 + 10 + 132 + 302 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 121804490025 + 99296832996 = 349005^2 + 315114^2 .

It is not a de Polignac number, because 221101323021 - 2² = 221101323017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221101322985 and 221101323003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101313021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 822916 + ... + 1058013.

It is an arithmetic number, because the mean of its divisors is an integer number (13705396445).

Almost surely, 2^221101323021 is an apocalyptic number.

It is an amenable number.

221101323021 is a deficient number, since it is larger than the sum of its proper divisors (107828191659).

221101323021 is a wasteful number, since it uses less digits than its factorization.

221101323021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881325 (or 1881322 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221101323021 its reverse (120323101122), we get a palindrome (341424424143).

The spelling of 221101323021 in words is "two hundred twenty-one billion, one hundred one million, three hundred twenty-three thousand, twenty-one".