20111111201001 has 8 divisors (see below), whose sum is σ = 27539539662784. Its totient is φ = 13045045103280.

The previous prime is 20111111200949. The next prime is 20111111201009. The reversal of 20111111201001 is 10010211111102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20111111201001 - 2²¹ = 20111109103849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111111201009) 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, 90590590885 + ... + 90590591106.

It is an arithmetic number, because the mean of its divisors is an integer number (3442442457848).

Almost surely, 2^{20111111201001} is an apocalyptic number.

It is an amenable number.

20111111201001 is a deficient number, since it is larger than the sum of its proper divisors (7428428461783).

20111111201001 is a wasteful number, since it uses less digits than its factorization.

20111111201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181181182031.

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

Adding to 20111111201001 its reverse (10010211111102), we get a palindrome (30121322312103).

The spelling of 20111111201001 in words is "twenty trillion, one hundred eleven billion, one hundred eleven million, two hundred one thousand, one".