21120022211 has 4 divisors (see below), whose sum is σ = 21129611352. Its totient is φ = 21110433072.

The previous prime is 21120022141. The next prime is 21120022219. The reversal of 21120022211 is 11222002112.

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 21120022211 - 2¹⁰ = 21120021187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120022219) 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, 4791266 + ... + 4795671.

It is an arithmetic number, because the mean of its divisors is an integer number (5282402838).

Almost surely, 2^21120022211 is an apocalyptic number.

21120022211 is a deficient number, since it is larger than the sum of its proper divisors (9589141).

21120022211 is an equidigital number, since it uses as much as digits as its factorization.

21120022211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9589140.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21120022211 its reverse (11222002112), we get a palindrome (32342024323).

The spelling of 21120022211 in words is "twenty-one billion, one hundred twenty million, twenty-two thousand, two hundred eleven".