21021201010011 has 16 divisors (see below), whose sum is σ = 29677105979424. Its totient is φ = 13189721485824.

The previous prime is 21021201009989. The next prime is 21021201010021. The reversal of 21021201010011 is 11001010212012.

It is not a de Polignac number, because 21021201010011 - 2³³ = 21012611075419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021201010021) 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, 15546421 + ... + 16844393.

It is an arithmetic number, because the mean of its divisors is an integer number (1854819123714).

Almost surely, 2^{21021201010011} is an apocalyptic number.

21021201010011 is a deficient number, since it is larger than the sum of its proper divisors (8655904969413).

21021201010011 is a wasteful number, since it uses less digits than its factorization.

21021201010011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615550.

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

Adding to 21021201010011 its reverse (11001010212012), we get a palindrome (32022211222023).

The spelling of 21021201010011 in words is "twenty-one trillion, twenty-one billion, two hundred one million, ten thousand, eleven".