21110010101 has 4 divisors (see below), whose sum is σ = 21319020204. Its totient is φ = 20901000000.

The previous prime is 21110010011. The next prime is 21110010109. The reversal of 21110010101 is 10101001112.

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 19396132900 + 1713877201 = 139270^2 + 41399^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110010101 - 2¹⁴ = 21109993717 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 (21110010109) 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, 104504900 + ... + 104505101.

It is an arithmetic number, because the mean of its divisors is an integer number (5329755051).

Almost surely, 2^21110010101 is an apocalyptic number.

It is an amenable number.

21110010101 is a deficient number, since it is larger than the sum of its proper divisors (209010103).

21110010101 is a wasteful number, since it uses less digits than its factorization.

21110010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209010102.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21110010101 its reverse (10101001112), we get a palindrome (31211011213).

The spelling of 21110010101 in words is "twenty-one billion, one hundred ten million, ten thousand, one hundred one".