21001010012211 has 4 divisors (see below), whose sum is σ = 28001346682952. Its totient is φ = 14000673341472.

The previous prime is 21001010012137. The next prime is 21001010012231. The reversal of 21001010012211 is 11221001010012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21001010012211 - 2⁷ = 21001010012083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001010012231) 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, 3500168335366 + ... + 3500168335371.

It is an arithmetic number, because the mean of its divisors is an integer number (7000336670738).

Almost surely, 2^{21001010012211} is an apocalyptic number.

21001010012211 is a deficient number, since it is larger than the sum of its proper divisors (7000336670741).

21001010012211 is an equidigital number, since it uses as much as digits as its factorization.

21001010012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000336670740.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001010012211 its reverse (11221001010012), we get a palindrome (32222011022223).

The spelling of 21001010012211 in words is "twenty-one trillion, one billion, ten million, twelve thousand, two hundred eleven".