20020001002101 has 6 divisors (see below), whose sum is σ = 28917779225270. Its totient is φ = 13346667334728.

The previous prime is 20020001002051. The next prime is 20020001002103. The reversal of 20020001002101 is 10120010002002.

It can be written as a sum of positive squares in only one way, i.e., 14754586968900 + 5265414033201 = 3841170^2 + 2294649^2 .

It is not a de Polignac number, because 20020001002101 - 2¹⁸ = 20020000739957 is a prime.

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: 2224444555789 = 20020001002101 / (2 + 0 + 0 + 2 + 0 + 0 + 0 + 1 + 0 + 0 + 2 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020001002103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112222277886 + ... + 1112222277903.

Almost surely, 2^{20020001002101} is an apocalyptic number.

It is an amenable number.

20020001002101 is a deficient number, since it is larger than the sum of its proper divisors (8897778223169).

20020001002101 is a wasteful number, since it uses less digits than its factorization.

20020001002101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224444555795 (or 2224444555792 counting only the distinct ones).

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

Adding to 20020001002101 its reverse (10120010002002), we get a palindrome (30140011004103).

The spelling of 20020001002101 in words is "twenty trillion, twenty billion, one million, two thousand, one hundred one".