20210121001111 has 4 divisors (see below), whose sum is σ = 20210590512000. Its totient is φ = 20209651490224.

The previous prime is 20210121001079. The next prime is 20210121001127. The reversal of 20210121001111 is 11110012101202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20210121001111 - 2⁵ = 20210121001079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210121001091 and 20210121001100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210121001181) 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, 234690871 + ... + 234776968.

It is an arithmetic number, because the mean of its divisors is an integer number (5052647628000).

Almost surely, 2^{20210121001111} is an apocalyptic number.

20210121001111 is a deficient number, since it is larger than the sum of its proper divisors (469510889).

20210121001111 is an equidigital number, since it uses as much as digits as its factorization.

20210121001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469510888.

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

Adding to 20210121001111 its reverse (11110012101202), we get a palindrome (31320133102313).

The spelling of 20210121001111 in words is "twenty trillion, two hundred ten billion, one hundred twenty-one million, one thousand, one hundred eleven".