21110013101 has 4 divisors (see below), whose sum is σ = 21124191900. Its totient is φ = 21095834304.

The previous prime is 21110013083. The next prime is 21110013103. The reversal of 21110013101 is 10131001112.

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 14007906025 + 7102107076 = 118355^2 + 84274^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110013101 - 2¹⁴ = 21109996717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110013103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7087166 + ... + 7090143.

It is an arithmetic number, because the mean of its divisors is an integer number (5281047975).

Almost surely, 2^21110013101 is an apocalyptic number.

It is an amenable number.

21110013101 is a deficient number, since it is larger than the sum of its proper divisors (14178799).

21110013101 is a wasteful number, since it uses less digits than its factorization.

21110013101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14178798.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 21110013101 its reverse (10131001112), we get a palindrome (31241014213).

The spelling of 21110013101 in words is "twenty-one billion, one hundred ten million, thirteen thousand, one hundred one".