21021112211001 has 16 divisors (see below), whose sum is σ = 32034284274048. Its totient is φ = 12011271638400.

The previous prime is 21021112210963. The next prime is 21021112211027. The reversal of 21021112211001 is 10011221112012.

It is a happy number.

It is not a de Polignac number, because 21021112211001 - 2⁷ = 21021112210873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021112211051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32694130 + ... + 33330891.

It is an arithmetic number, because the mean of its divisors is an integer number (2002142767128).

Almost surely, 2^{21021112211001} is an apocalyptic number.

21021112211001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21021112211001 is a deficient number, since it is larger than the sum of its proper divisors (11013172063047).

21021112211001 is a wasteful number, since it uses less digits than its factorization.

21021112211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66040192.

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

Adding to 21021112211001 its reverse (10011221112012), we get a palindrome (31032333323013).

The spelling of 21021112211001 in words is "twenty-one trillion, twenty-one billion, one hundred twelve million, two hundred eleven thousand, one".