20120002101 has 32 divisors (see below), whose sum is σ = 31431628800. Its totient is φ = 12684930480.

The previous prime is 20120002099. The next prime is 20120002157. The reversal of 20120002101 is 10120002102.

It is not a de Polignac number, because 20120002101 - 2¹ = 20120002099 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120002171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258580 + ... + 327266.

It is an arithmetic number, because the mean of its divisors is an integer number (982238400).

Almost surely, 2^20120002101 is an apocalyptic number.

It is an amenable number.

20120002101 is a deficient number, since it is larger than the sum of its proper divisors (11311626699).

20120002101 is a wasteful number, since it uses less digits than its factorization.

20120002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69286 (or 69280 counting only the distinct ones).

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

Adding to 20120002101 its reverse (10120002102), we get a palindrome (30240004203).

Subtracting from 20120002101 its reverse (10120002102), we obtain a palindrome (9999999999).

The spelling of 20120002101 in words is "twenty billion, one hundred twenty million, two thousand, one hundred one".