20010121021111 has 8 divisors (see below), whose sum is σ = 22683537999920. Its totient is φ = 17498729313792.

The previous prime is 20010121021103. The next prime is 20010121021127. The reversal of 20010121021111 is 11112012101002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20010121021111 - 2³ = 20010121021103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010121021091 and 20010121021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010121021171) 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, 40506317610 + ... + 40506318103.

It is an arithmetic number, because the mean of its divisors is an integer number (2835442249990).

Almost surely, 2^{20010121021111} is an apocalyptic number.

20010121021111 is a deficient number, since it is larger than the sum of its proper divisors (2673416978809).

20010121021111 is a wasteful number, since it uses less digits than its factorization.

20010121021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81012635745.

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

Adding to 20010121021111 its reverse (11112012101002), we get a palindrome (31122133122113).

The spelling of 20010121021111 in words is "twenty trillion, ten billion, one hundred twenty-one million, twenty-one thousand, one hundred eleven".