21011313101 has 8 divisors (see below), whose sum is σ = 21059452920. Its totient is φ = 20963225088.

The previous prime is 21011313067. The next prime is 21011313151. The reversal of 21011313101 is 10131311012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18384648100 + 2626665001 = 135590^2 + 51251^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011313101 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 (21011313151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 866105 + ... + 890033.

It is an arithmetic number, because the mean of its divisors is an integer number (2632431615).

Almost surely, 2^21011313101 is an apocalyptic number.

It is an amenable number.

21011313101 is a deficient number, since it is larger than the sum of its proper divisors (48139819).

21011313101 is a wasteful number, since it uses less digits than its factorization.

21011313101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25903.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 21011313101 its reverse (10131311012), we get a palindrome (31142624113).

The spelling of 21011313101 in words is "twenty-one billion, eleven million, three hundred thirteen thousand, one hundred one".