221210211011 has 4 divisors (see below), whose sum is σ = 221212357800. Its totient is φ = 221208064224.

The previous prime is 221210211007. The next prime is 221210211023. The reversal of 221210211011 is 110112012122.

221210211011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221210211011 - 2² = 221210211007 is a prime.

It is a super-2 number, since 2×221210211011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221210211311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910601 + ... + 1127658.

It is an arithmetic number, because the mean of its divisors is an integer number (55303089450).

Almost surely, 2^221210211011 is an apocalyptic number.

221210211011 is a deficient number, since it is larger than the sum of its proper divisors (2146789).

221210211011 is a wasteful number, since it uses less digits than its factorization.

221210211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146788.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221210211011 its reverse (110112012122), we get a palindrome (331322223133).

The spelling of 221210211011 in words is "two hundred twenty-one billion, two hundred ten million, two hundred eleven thousand, eleven".