20101111121001 has 16 divisors (see below), whose sum is σ = 28038657329280. Its totient is φ = 12785148414720.

The previous prime is 20101111120957. The next prime is 20101111121041. The reversal of 20101111121001 is 10012111110102.

It is not a de Polignac number, because 20101111121001 - 2²³ = 20101102732393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20101111121041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 374421040 + ... + 374474721.

It is an arithmetic number, because the mean of its divisors is an integer number (1752416083080).

Almost surely, 2^{20101111121001} is an apocalyptic number.

It is an amenable number.

20101111121001 is a deficient number, since it is larger than the sum of its proper divisors (7937546208279).

20101111121001 is a wasteful number, since it uses less digits than its factorization.

20101111121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748896176.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 20101111121001 its reverse (10012111110102), we get a palindrome (30113222231103).

The spelling of 20101111121001 in words is "twenty trillion, one hundred one billion, one hundred eleven million, one hundred twenty-one thousand, one".