20001121121211 has 8 divisors (see below), whose sum is σ = 26668223906304. Its totient is φ = 13334049541800.

The previous prime is 20001121121209. The next prime is 20001121121257. The reversal of 20001121121211 is 11212112110002.

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 20001121121211 - 2¹ = 20001121121209 is a prime.

It is a super-2 number, since 2×20001121121211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20001121122211) 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, 6262515 + ... + 8900636.

It is an arithmetic number, because the mean of its divisors is an integer number (3333527988288).

Almost surely, 2^{20001121121211} is an apocalyptic number.

20001121121211 is a deficient number, since it is larger than the sum of its proper divisors (6667102785093).

20001121121211 is a wasteful number, since it uses less digits than its factorization.

20001121121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15602841.

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

Adding to 20001121121211 its reverse (11212112110002), we get a palindrome (31213233231213).

The spelling of 20001121121211 in words is "twenty trillion, one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred eleven".