21021001001211 has 8 divisors (see below), whose sum is σ = 28028032271680. Its totient is φ = 14013985199112.

The previous prime is 21021001001201. The next prime is 21021001001321. The reversal of 21021001001211 is 11210010012012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21021001001211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021001001201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199165 + ... + 6487038.

It is an arithmetic number, because the mean of its divisors is an integer number (3503504033960).

Almost surely, 2^{21021001001211} is an apocalyptic number.

21021001001211 is a deficient number, since it is larger than the sum of its proper divisors (7007031270469).

21021001001211 is a wasteful number, since it uses less digits than its factorization.

21021001001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7734185.

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

Adding to 21021001001211 its reverse (11210010012012), we get a palindrome (32231011013223).

The spelling of 21021001001211 in words is "twenty-one trillion, twenty-one billion, one million, one thousand, two hundred eleven".