211103021221 has 16 divisors (see below), whose sum is σ = 225126895104. Its totient is φ = 197488998784.

The previous prime is 211103021201. The next prime is 211103021263. The reversal of 211103021221 is 122120301112.

It is not a de Polignac number, because 211103021221 - 2⁵ = 211103021189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211103021195 and 211103021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211103021201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1480935 + ... + 1617211.

It is an arithmetic number, because the mean of its divisors is an integer number (14070430944).

Almost surely, 2^211103021221 is an apocalyptic number.

It is an amenable number.

211103021221 is a deficient number, since it is larger than the sum of its proper divisors (14023873883).

211103021221 is a wasteful number, since it uses less digits than its factorization.

211103021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137780.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 211103021221 its reverse (122120301112), we get a palindrome (333223322333).

The spelling of 211103021221 in words is "two hundred eleven billion, one hundred three million, twenty-one thousand, two hundred twenty-one".