21211120011 has 8 divisors (see below), whose sum is σ = 28504182784. Its totient is φ = 14029401960.

The previous prime is 21211120001. The next prime is 21211120013. The reversal of 21211120011 is 11002111212.

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

It is not a de Polignac number, because 21211120011 - 2¹⁰ = 21211118987 is a prime.

It is a super-2 number, since 2×21211120011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211120013) 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, 27835735 + ... + 27836496.

It is an arithmetic number, because the mean of its divisors is an integer number (3563022848).

Almost surely, 2^21211120011 is an apocalyptic number.

21211120011 is a deficient number, since it is larger than the sum of its proper divisors (7293062773).

21211120011 is a wasteful number, since it uses less digits than its factorization.

21211120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55672361.

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

Adding to 21211120011 its reverse (11002111212), we get a palindrome (32213231223).

The spelling of 21211120011 in words is "twenty-one billion, two hundred eleven million, one hundred twenty thousand, eleven".