20000121021111 has 32 divisors (see below), whose sum is σ = 33254762342400. Its totient is φ = 10387233283680.

The previous prime is 20000121021031. The next prime is 20000121021131. The reversal of 20000121021111 is 11112012100002.

It is not a de Polignac number, because 20000121021111 - 2⁹ = 20000121020599 is a prime.

It is a super-2 number, since 2×20000121021111² (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 (20000121021131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9180601 + ... + 11148258.

It is an arithmetic number, because the mean of its divisors is an integer number (1039211323200).

Almost surely, 2^{20000121021111} is an apocalyptic number.

20000121021111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20000121021111 is a deficient number, since it is larger than the sum of its proper divisors (13254641321289).

20000121021111 is a wasteful number, since it uses less digits than its factorization.

20000121021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20333139.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20000121021111 its reverse (11112012100002), we get a palindrome (31112133121113).

The spelling of 20000121021111 in words is "twenty trillion, one hundred twenty-one million, twenty-one thousand, one hundred eleven".