221111101010221 has 4 divisors (see below), whose sum is σ = 232748527379200. Its totient is φ = 209473674641244.

The previous prime is 221111101010209. The next prime is 221111101010237. The reversal of 221111101010221 is 122010101111122.

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 de Polignac number, because none of the positive numbers 2^k-221111101010221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221111101010195 and 221111101010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111101010201) 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, 5818713184461 + ... + 5818713184498.

It is an arithmetic number, because the mean of its divisors is an integer number (58187131844800).

Almost surely, 2^{221111101010221} is an apocalyptic number.

It is an amenable number.

221111101010221 is a deficient number, since it is larger than the sum of its proper divisors (11637426368979).

221111101010221 is a wasteful number, since it uses less digits than its factorization.

221111101010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11637426368978.

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

Adding to 221111101010221 its reverse (122010101111122), we get a palindrome (343121202121343).

The spelling of 221111101010221 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred one million, ten thousand, two hundred twenty-one".