20211011121111 has 8 divisors (see below), whose sum is σ = 27817305629184. Its totient is φ = 13039362013560.

The previous prime is 20211011121109. The next prime is 20211011121131. The reversal of 20211011121111 is 11112111011202.

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

It is not a de Polignac number, because 20211011121111 - 2¹ = 20211011121109 is a prime.

It is a super-2 number, since 2×20211011121111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211011121131) 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, 108661350021 + ... + 108661350206.

It is an arithmetic number, because the mean of its divisors is an integer number (3477163203648).

Almost surely, 2^{20211011121111} is an apocalyptic number.

20211011121111 is a deficient number, since it is larger than the sum of its proper divisors (7606294508073).

20211011121111 is a wasteful number, since it uses less digits than its factorization.

20211011121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217322700261.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 20211011121111 its reverse (11112111011202), we get a palindrome (31323122132313).

The spelling of 20211011121111 in words is "twenty trillion, two hundred eleven billion, eleven million, one hundred twenty-one thousand, one hundred eleven".