21012222012211 has 4 divisors (see below), whose sum is σ = 21012251050624. Its totient is φ = 21012192973800.

The previous prime is 21012222012179. The next prime is 21012222012217. The reversal of 21012222012211 is 11221022221012.

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 21012222012211 - 2⁵ = 21012222012179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012222012217) 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, 13405320 + ... + 14890501.

It is an arithmetic number, because the mean of its divisors is an integer number (5253062762656).

Almost surely, 2^{21012222012211} is an apocalyptic number.

21012222012211 is a deficient number, since it is larger than the sum of its proper divisors (29038413).

21012222012211 is an equidigital number, since it uses as much as digits as its factorization.

21012222012211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29038412.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21012222012211 its reverse (11221022221012), we get a palindrome (32233244233223).

The spelling of 21012222012211 in words is "twenty-one trillion, twelve billion, two hundred twenty-two million, twelve thousand, two hundred eleven".