20100020021001 has 20 divisors (see below), whose sum is σ = 31606269301200. Its totient is φ = 12694749485976.

The previous prime is 20100020020999. The next prime is 20100020021017. The reversal of 20100020021001 is 10012002000102.

It is not a de Polignac number, because 20100020021001 - 2¹ = 20100020020999 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20100020021051) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6530219391 + ... + 6530222468.

It is an arithmetic number, because the mean of its divisors is an integer number (1580313465060).

Almost surely, 2^{20100020021001} is an apocalyptic number.

It is an amenable number.

20100020021001 is a deficient number, since it is larger than the sum of its proper divisors (11506249280199).

20100020021001 is a wasteful number, since it uses less digits than its factorization.

20100020021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13060441890 (or 13060441881 counting only the distinct ones).

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

Adding to 20100020021001 its reverse (10012002000102), we get a palindrome (30112022021103).

The spelling of 20100020021001 in words is "twenty trillion, one hundred billion, twenty million, twenty-one thousand, one".