221101110210021 has 16 divisors (see below), whose sum is σ = 312146175221568. Its totient is φ = 138728583302400.

The previous prime is 221101110209933. The next prime is 221101110210037. The reversal of 221101110210021 is 120012011101122.

It is a happy number.

It is not a de Polignac number, because 221101110210021 - 2²⁷ = 221100975992293 is a prime.

It is a super-2 number, since 2×221101110210021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101110215021) 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 15 ways as a sum of consecutive naturals, for example, 19135375 + ... + 28431756.

It is an arithmetic number, because the mean of its divisors is an integer number (19509135951348).

Almost surely, 2^{221101110210021} is an apocalyptic number.

It is an amenable number.

221101110210021 is a deficient number, since it is larger than the sum of its proper divisors (91045065011547).

221101110210021 is a wasteful number, since it uses less digits than its factorization.

221101110210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47658292.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221101110210021 its reverse (120012011101122), we get a palindrome (341113121311143).

The spelling of 221101110210021 in words is "two hundred twenty-one trillion, one hundred one billion, one hundred ten million, two hundred ten thousand, twenty-one".