20541210101 has 4 divisors (see below), whose sum is σ = 20541511692. Its totient is φ = 20540908512.

The previous prime is 20541210083. The next prime is 20541210127. The reversal of 20541210101 is 10101214502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2475162001 + 18066048100 = 49751^2 + 134410^2 .

It is a cyclic number.

It is not a de Polignac number, because 20541210101 - 2¹⁰ = 20541209077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20541210101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541210401) 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, 5075 + ... + 202751.

It is an arithmetic number, because the mean of its divisors is an integer number (5135377923).

Almost surely, 2^20541210101 is an apocalyptic number.

It is an amenable number.

20541210101 is a deficient number, since it is larger than the sum of its proper divisors (301591).

20541210101 is a wasteful number, since it uses less digits than its factorization.

20541210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301590.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 20541210101 its reverse (10101214502), we get a palindrome (30642424603).

The spelling of 20541210101 in words is "twenty billion, five hundred forty-one million, two hundred ten thousand, one hundred one".