21002120220011 has 8 divisors (see below), whose sum is σ = 24340485406464. Its totient is φ = 17748270608040.

The previous prime is 21002120219989. The next prime is 21002120220013. The reversal of 21002120220011 is 11002202120012.

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

It is not a de Polignac number, because 21002120220011 - 2¹⁴ = 21002120203627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002120220013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21128893085 + ... + 21128894078.

It is an arithmetic number, because the mean of its divisors is an integer number (3042560675808).

Almost surely, 2^{21002120220011} is an apocalyptic number.

21002120220011 is a deficient number, since it is larger than the sum of its proper divisors (3338365186453).

21002120220011 is an equidigital number, since it uses as much as digits as its factorization.

21002120220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42257787241.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21002120220011 its reverse (11002202120012), we get a palindrome (32004322340023).

The spelling of 21002120220011 in words is "twenty-one trillion, two billion, one hundred twenty million, two hundred twenty thousand, eleven".