20111220001 has 8 divisors (see below), whose sum is σ = 20763961344. Its totient is φ = 19466203680.

The previous prime is 20111219981. The next prime is 20111220007. The reversal of 20111220001 is 10002211102.

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

It is a cyclic number.

It is not a de Polignac number, because 20111220001 - 2⁵ = 20111219969 is a prime.

It is a super-2 number, since 2×20111220001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111220001.

It is not an unprimeable number, because it can be changed into a prime (20111220007) 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, 1925965 + ... + 1936378.

It is an arithmetic number, because the mean of its divisors is an integer number (2595495168).

Almost surely, 2^20111220001 is an apocalyptic number.

It is an amenable number.

20111220001 is a deficient number, since it is larger than the sum of its proper divisors (652741343).

20111220001 is a wasteful number, since it uses less digits than its factorization.

20111220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3862511.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20111220001 its reverse (10002211102), we get a palindrome (30113431103).

The spelling of 20111220001 in words is "twenty billion, one hundred eleven million, two hundred twenty thousand, one".