20101001213 has 4 divisors (see below), whose sum is σ = 20376357468. Its totient is φ = 19825644960.

The previous prime is 20101001209. The next prime is 20101001257. The reversal of 20101001213 is 31210010102.

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 15341795044 + 4759206169 = 123862^2 + 68987^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101001213 - 2² = 20101001209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101001194 and 20101001203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101001293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137678018 + ... + 137678163.

It is an arithmetic number, because the mean of its divisors is an integer number (5094089367).

Almost surely, 2^20101001213 is an apocalyptic number.

It is an amenable number.

20101001213 is a deficient number, since it is larger than the sum of its proper divisors (275356255).

20101001213 is an equidigital number, since it uses as much as digits as its factorization.

20101001213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275356254.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20101001213 its reverse (31210010102), we get a palindrome (51311011315).

The spelling of 20101001213 in words is "twenty billion, one hundred one million, one thousand, two hundred thirteen".