20111021011 has 8 divisors (see below), whose sum is σ = 20255485184. Its totient is φ = 19966814280.

The previous prime is 20111020957. The next prime is 20111021023. The reversal of 20111021011 is 11012011102.

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

It is a cyclic number.

It is not a de Polignac number, because 20111021011 - 2⁷ = 20111020883 is a prime.

It is a super-2 number, since 2×20111021011² (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 (20111031011) 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, 93826 + ... + 221416.

It is an arithmetic number, because the mean of its divisors is an integer number (2531935648).

Almost surely, 2^20111021011 is an apocalyptic number.

20111021011 is a deficient number, since it is larger than the sum of its proper divisors (144464173).

20111021011 is a wasteful number, since it uses less digits than its factorization.

20111021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128721.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20111021011 its reverse (11012011102), we get a palindrome (31123032113).

Subtracting from 20111021011 its reverse (11012011102), we obtain a palindrome (9099009909).

The spelling of 20111021011 in words is "twenty billion, one hundred eleven million, twenty-one thousand, eleven".