21010120112211 has 4 divisors (see below), whose sum is σ = 28013493482952. Its totient is φ = 14006746741472.

The previous prime is 21010120112159. The next prime is 21010120112309. The reversal of 21010120112211 is 11221102101012.

It is a happy number.

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 21010120112211 - 2²² = 21010115917907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21010120112411) 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, 3501686685366 + ... + 3501686685371.

It is an arithmetic number, because the mean of its divisors is an integer number (7003373370738).

Almost surely, 2^{21010120112211} is an apocalyptic number.

21010120112211 is a deficient number, since it is larger than the sum of its proper divisors (7003373370741).

21010120112211 is an equidigital number, since it uses as much as digits as its factorization.

21010120112211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7003373370740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21010120112211 its reverse (11221102101012), we get a palindrome (32231222213223).

The spelling of 21010120112211 in words is "twenty-one trillion, ten billion, one hundred twenty million, one hundred twelve thousand, two hundred eleven".