20021111000001 has 6 divisors (see below), whose sum is σ = 28919382555570. Its totient is φ = 13347407333328.

The previous prime is 20021110999997. The next prime is 20021111000089. The reversal of 20021111000001 is 10000011112002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19925072990001 + 96038010000 = 4463751^2 + 309900^2 .

It is not a de Polignac number, because 20021111000001 - 2² = 20021110999997 is a prime.

It is a super-2 number, since 2×20021111000001² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2224567888889 = 20021111000001 / (2 + 0 + 0 + 2 + 1 + 1 + 1 + 1 + 0 + 0 + 0 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (20021111005001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112283944436 + ... + 1112283944453.

It is an arithmetic number, because the mean of its divisors is an integer number (4819897092595).

Almost surely, 2^{20021111000001} is an apocalyptic number.

It is an amenable number.

20021111000001 is a deficient number, since it is larger than the sum of its proper divisors (8898271555569).

20021111000001 is a wasteful number, since it uses less digits than its factorization.

20021111000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224567888895 (or 2224567888892 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20021111000001 its reverse (10000011112002), we get a palindrome (30021122112003).

The spelling of 20021111000001 in words is "twenty trillion, twenty-one billion, one hundred eleven million, one", and thus it is an aban number.