221012011 has 4 divisors (see below), whose sum is σ = 241104024. Its totient is φ = 200920000.

The previous prime is 221011993. The next prime is 221012039. The reversal of 221012011 is 110210122.

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 221012011 - 2⁹ = 221011499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221012081) 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, 10045990 + ... + 10046011.

It is an arithmetic number, because the mean of its divisors is an integer number (60276006).

Almost surely, 2^221012011 is an apocalyptic number.

221012011 is a deficient number, since it is larger than the sum of its proper divisors (20092013).

221012011 is a wasteful number, since it uses less digits than its factorization.

221012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20092012.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 221012011 is about 14866.4727154763. The cubic root of 221012011 is about 604.6053123181.

Adding to 221012011 its reverse (110210122), we get a palindrome (331222133).

The spelling of 221012011 in words is "two hundred twenty-one million, twelve thousand, eleven".