20001010021101 has 24 divisors (see below), whose sum is σ = 28902334032000. Its totient is φ = 13328475314112.

The previous prime is 20001010021099. The next prime is 20001010021159. The reversal of 20001010021101 is 10112001010002.

It is a happy number.

It is not a de Polignac number, because 20001010021101 - 2¹ = 20001010021099 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001010021001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 507118140 + ... + 507157578.

It is an arithmetic number, because the mean of its divisors is an integer number (1204263918000).

Almost surely, 2^{20001010021101} is an apocalyptic number.

It is an amenable number.

20001010021101 is a deficient number, since it is larger than the sum of its proper divisors (8901324010899).

20001010021101 is a wasteful number, since it uses less digits than its factorization.

20001010021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61393 (or 61390 counting only the distinct ones).

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

Adding to 20001010021101 its reverse (10112001010002), we get a palindrome (30113011031103).

The spelling of 20001010021101 in words is "twenty trillion, one billion, ten million, twenty-one thousand, one hundred one".