20121002210101 has 4 divisors (see below), whose sum is σ = 21668771610892. Its totient is φ = 18573232809312.

The previous prime is 20121002210087. The next prime is 20121002210107. The reversal of 20121002210101 is 10101220012102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1839348963076 + 18281653247025 = 1356226^2 + 4275705^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121002210101 - 2⁹ = 20121002209589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1547769400777 = 20121002210101 / (2 + 0 + 1 + 2 + 1 + 0 + 0 + 2 + 2 + 1 + 0 + 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 (20121002210107) 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, 773884700376 + ... + 773884700401.

It is an arithmetic number, because the mean of its divisors is an integer number (5417192902723).

Almost surely, 2^{20121002210101} is an apocalyptic number.

It is an amenable number.

20121002210101 is a deficient number, since it is larger than the sum of its proper divisors (1547769400791).

20121002210101 is a wasteful number, since it uses less digits than its factorization.

20121002210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547769400790.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20121002210101 its reverse (10101220012102), we get a palindrome (30222222222203).

The spelling of 20121002210101 in words is "twenty trillion, one hundred twenty-one billion, two million, two hundred ten thousand, one hundred one".