20001002121111 has 24 divisors (see below), whose sum is σ = 29315247357312. Its totient is φ = 12120792283600.

The previous prime is 20001002121091. The next prime is 20001002121119. The reversal of 20001002121111 is 11112120010002.

It is not a de Polignac number, because 20001002121111 - 2⁶ = 20001002121047 is a prime.

It is a super-2 number, since 2×20001002121111² (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 (20001002121119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1966060 + ... + 6623246.

It is an arithmetic number, because the mean of its divisors is an integer number (1221468639888).

Almost surely, 2^{20001002121111} is an apocalyptic number.

20001002121111 is a deficient number, since it is larger than the sum of its proper divisors (9314245236201).

20001002121111 is a wasteful number, since it uses less digits than its factorization.

20001002121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4669043 (or 4669032 counting only the distinct ones).

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

Adding to 20001002121111 its reverse (11112120010002), we get a palindrome (31113122131113).

The spelling of 20001002121111 in words is "twenty trillion, one billion, two million, one hundred twenty-one thousand, one hundred eleven".