20001121001211 has 32 divisors (see below), whose sum is σ = 32271224836608. Its totient is φ = 10756735879680.

The previous prime is 20001121001207. The next prime is 20001121001311. The reversal of 20001121001211 is 11210012110002.

It is not a de Polignac number, because 20001121001211 - 2² = 20001121001207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20001121001311) 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, 24159156 + ... + 24973326.

It is an arithmetic number, because the mean of its divisors is an integer number (1008475776144).

Almost surely, 2^{20001121001211} is an apocalyptic number.

20001121001211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20001121001211 is a deficient number, since it is larger than the sum of its proper divisors (12270103835397).

20001121001211 is a wasteful number, since it uses less digits than its factorization.

20001121001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883011.

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

Adding to 20001121001211 its reverse (11210012110002), we get a palindrome (31211133111213).

The spelling of 20001121001211 in words is "twenty trillion, one billion, one hundred twenty-one million, one thousand, two hundred eleven".