21011021021001 has 32 divisors (see below), whose sum is σ = 31972225858560. Its totient is φ = 12148990040000.

The previous prime is 21011021020939. The next prime is 21011021021071. The reversal of 21011021021001 is 10012012011012.

It is not a de Polignac number, because 21011021021001 - 2¹⁰ = 21011021019977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011021021071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35286375 + ... + 35876876.

It is an arithmetic number, because the mean of its divisors is an integer number (999132058080).

Almost surely, 2^{21011021021001} is an apocalyptic number.

It is an amenable number.

21011021021001 is a deficient number, since it is larger than the sum of its proper divisors (10961204837559).

21011021021001 is a wasteful number, since it uses less digits than its factorization.

21011021021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71163677.

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

Adding to 21011021021001 its reverse (10012012011012), we get a palindrome (31023033032013).

The spelling of 21011021021001 in words is "twenty-one trillion, eleven billion, twenty-one million, twenty-one thousand, one".