221021212103 has 8 divisors (see below), whose sum is σ = 230311561680. Its totient is φ = 211842124480.

The previous prime is 221021212081. The next prime is 221021212117. The reversal of 221021212103 is 301212120122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221021212103 - 2³⁴ = 203841342919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021212123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27811433 + ... + 27819378.

It is an arithmetic number, because the mean of its divisors is an integer number (28788945210).

Almost surely, 2^221021212103 is an apocalyptic number.

221021212103 is a deficient number, since it is larger than the sum of its proper divisors (9290349577).

221021212103 is a wasteful number, since it uses less digits than its factorization.

221021212103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55630977.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 221021212103 its reverse (301212120122), we get a palindrome (522233332225).

The spelling of 221021212103 in words is "two hundred twenty-one billion, twenty-one million, two hundred twelve thousand, one hundred three".