21210111001011 has 4 divisors (see below), whose sum is σ = 28280148001352. Its totient is φ = 14140074000672.

The previous prime is 21210111001007. The next prime is 21210111001019. The reversal of 21210111001011 is 11010011101212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21210111001011 - 2² = 21210111001007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210111001019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3535018500166 + ... + 3535018500171.

It is an arithmetic number, because the mean of its divisors is an integer number (7070037000338).

Almost surely, 2^{21210111001011} is an apocalyptic number.

21210111001011 is a deficient number, since it is larger than the sum of its proper divisors (7070037000341).

21210111001011 is an equidigital number, since it uses as much as digits as its factorization.

21210111001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7070037000340.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21210111001011 its reverse (11010011101212), we get a palindrome (32220122102223).

The spelling of 21210111001011 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one thousand, eleven".