20011122111021 has 4 divisors (see below), whose sum is σ = 26681496148032. Its totient is φ = 13340748074012.

The previous prime is 20011122110989. The next prime is 20011122111023. The reversal of 20011122111021 is 12011122111002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20011122111021 - 2⁵ = 20011122110989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011122111023) 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, 3335187018501 + ... + 3335187018506.

It is an arithmetic number, because the mean of its divisors is an integer number (6670374037008).

Almost surely, 2^{20011122111021} is an apocalyptic number.

It is an amenable number.

20011122111021 is a deficient number, since it is larger than the sum of its proper divisors (6670374037011).

20011122111021 is an equidigital number, since it uses as much as digits as its factorization.

20011122111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6670374037010.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20011122111021 its reverse (12011122111002), we get a palindrome (32022244222023).

The spelling of 20011122111021 in words is "twenty trillion, eleven billion, one hundred twenty-two million, one hundred eleven thousand, twenty-one".