221243101211 has 4 divisors (see below), whose sum is σ = 241356110424. Its totient is φ = 201130092000.

The previous prime is 221243101153. The next prime is 221243101237. The reversal of 221243101211 is 112101342122.

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 221243101211 - 2⁶ = 221243101147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221243101271) 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, 10056504590 + ... + 10056504611.

It is an arithmetic number, because the mean of its divisors is an integer number (60339027606).

Almost surely, 2^221243101211 is an apocalyptic number.

221243101211 is a deficient number, since it is larger than the sum of its proper divisors (20113009213).

221243101211 is a wasteful number, since it uses less digits than its factorization.

221243101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20113009212.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 221243101211 its reverse (112101342122), we get a palindrome (333344443333).

The spelling of 221243101211 in words is "two hundred twenty-one billion, two hundred forty-three million, one hundred one thousand, two hundred eleven".