21021122211001 has 8 divisors (see below), whose sum is σ = 23420051051904. Its totient is φ = 18703512991920.

The previous prime is 21021122210947. The next prime is 21021122211043. The reversal of 21021122211001 is 10011222112012.

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

It is a cyclic number.

It is not a de Polignac number, because 21021122211001 - 2¹³ = 21021122202809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021122211701) 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, 20329904910 + ... + 20329905943.

It is an arithmetic number, because the mean of its divisors is an integer number (2927506381488).

Almost surely, 2^{21021122211001} is an apocalyptic number.

It is an amenable number.

21021122211001 is a deficient number, since it is larger than the sum of its proper divisors (2398928840903).

21021122211001 is a wasteful number, since it uses less digits than its factorization.

21021122211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40659810911.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021122211001 its reverse (10011222112012), we get a palindrome (31032344323013).

The spelling of 21021122211001 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, one".