20010221000001 has 12 divisors (see below), whose sum is σ = 28903963716628. Its totient is φ = 13340003720544.

The previous prime is 20010220999999. The next prime is 20010221000009. The reversal of 20010221000001 is 10000012201002.

It can be written as a sum of positive squares in 2 ways, for example, as 10021783118400 + 9988437881601 = 3165720^2 + 3160449^2 .

It is not a de Polignac number, because 20010221000001 - 2¹ = 20010220999999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010221000009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11081830 + ... + 12760383.

Almost surely, 2^{20010221000001} is an apocalyptic number.

It is an amenable number.

20010221000001 is a deficient number, since it is larger than the sum of its proper divisors (8893742716627).

20010221000001 is a wasteful number, since it uses less digits than its factorization.

20010221000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23935472 (or 23935469 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20010221000001 its reverse (10000012201002), we get a palindrome (30010233201003).

The spelling of 20010221000001 in words is "twenty trillion, ten billion, two hundred twenty-one million, one", and thus it is an aban number.