20010002101 has 4 divisors (see below), whose sum is σ = 20021823052. Its totient is φ = 19998181152.

The previous prime is 20010002027. The next prime is 20010002107. The reversal of 20010002101 is 10120001002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10120001002 = 2 ⋅5060000501.

It can be written as a sum of positive squares in 2 ways, for example, as 14671507876 + 5338494225 = 121126^2 + 73065^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010002101 - 2¹¹ = 20010000053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010002107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5907936 + ... + 5911321.

It is an arithmetic number, because the mean of its divisors is an integer number (5005455763).

Almost surely, 2^20010002101 is an apocalyptic number.

It is an amenable number.

20010002101 is a deficient number, since it is larger than the sum of its proper divisors (11820951).

20010002101 is a wasteful number, since it uses less digits than its factorization.

20010002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11820950.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20010002101 its reverse (10120001002), we get a palindrome (30130003103).

The spelling of 20010002101 in words is "twenty billion, ten million, two thousand, one hundred one".