20111021021011 has 8 divisors (see below), whose sum is σ = 20764610786304. Its totient is φ = 19457734202760.

The previous prime is 20111021020991. The next prime is 20111021021029. The reversal of 20111021021011 is 11012012011102.

It is a happy number.

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 20111021021011 - 2¹⁵ = 20111020988243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111021020982 and 20111021021000.

It is not an unprimeable number, because it can be changed into a prime (20111025021011) 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, 75601831 + ... + 75867376.

It is an arithmetic number, because the mean of its divisors is an integer number (2595576348288).

Almost surely, 2^{20111021021011} is an apocalyptic number.

20111021021011 is a deficient number, since it is larger than the sum of its proper divisors (653589765293).

20111021021011 is a wasteful number, since it uses less digits than its factorization.

20111021021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151473521.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20111021021011 its reverse (11012012011102), we get a palindrome (31123033032113).

Subtracting from 20111021021011 its reverse (11012012011102), we obtain a palindrome (9099009009909).

The spelling of 20111021021011 in words is "twenty trillion, one hundred eleven billion, twenty-one million, twenty-one thousand, eleven".