21201012011101 has 4 divisors (see below), whose sum is σ = 22831859088892. Its totient is φ = 19570164933312.

The previous prime is 21201012011099. The next prime is 21201012011131. The reversal of 21201012011101 is 10111021010212.

It is a happy number.

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 2485446840900 + 18715565170201 = 1576530^2 + 4326149^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201012011101 - 2¹ = 21201012011099 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: 1630847077777 = 21201012011101 / (2 + 1 + 2 + 0 + 1 + 0 + 1 + 2 + 0 + 1 + 1 + 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 (21201012011131) 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, 815423538876 + ... + 815423538901.

It is an arithmetic number, because the mean of its divisors is an integer number (5707964772223).

Almost surely, 2^{21201012011101} is an apocalyptic number.

It is an amenable number.

21201012011101 is a deficient number, since it is larger than the sum of its proper divisors (1630847077791).

21201012011101 is a wasteful number, since it uses less digits than its factorization.

21201012011101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630847077790.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21201012011101 its reverse (10111021010212), we get a palindrome (31312033021313).

The spelling of 21201012011101 in words is "twenty-one trillion, two hundred one billion, twelve million, eleven thousand, one hundred one".