20211121111111 has 8 divisors (see below), whose sum is σ = 23327121396384. Its totient is φ = 17152295143200.

The previous prime is 20211121111099. The next prime is 20211121111123. The reversal of 20211121111111 is 11111112111202.

It is an interprime number because it is at equal distance from previous prime (20211121111099) and next prime (20211121111123).

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

It is not a de Polignac number, because 20211121111111 - 2²¹ = 20211119013959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211121511111) 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, 14293578580 + ... + 14293579993.

It is an arithmetic number, because the mean of its divisors is an integer number (2915890174548).

Almost surely, 2^{20211121111111} is an apocalyptic number.

20211121111111 is a deficient number, since it is larger than the sum of its proper divisors (3116000285273).

20211121111111 is a wasteful number, since it uses less digits than its factorization.

20211121111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28587158681.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 20211121111111 its reverse (11111112111202), we get a palindrome (31322233222313).

The spelling of 20211121111111 in words is "twenty trillion, two hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, one hundred eleven".