20010121122111 has 8 divisors (see below), whose sum is σ = 26738036034864. Its totient is φ = 13311143478720.

The previous prime is 20010121122107. The next prime is 20010121122113. The reversal of 20010121122111 is 11122112101002.

It is a happy number.

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

It is not a de Polignac number, because 20010121122111 - 2² = 20010121122107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010121122113) 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, 7234315726 + ... + 7234318491.

It is an arithmetic number, because the mean of its divisors is an integer number (3342254504358).

Almost surely, 2^{20010121122111} is an apocalyptic number.

20010121122111 is a deficient number, since it is larger than the sum of its proper divisors (6727914912753).

20010121122111 is a wasteful number, since it uses less digits than its factorization.

20010121122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14468634681.

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

Adding to 20010121122111 its reverse (11122112101002), we get a palindrome (31132233223113).

The spelling of 20010121122111 in words is "twenty trillion, ten billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred eleven".