21311013101 has 24 divisors (see below), whose sum is σ = 25593193920. Its totient is φ = 17381270016.

The previous prime is 21311013083. The next prime is 21311013133. The reversal of 21311013101 is 10131011312.

It is a happy number.

It is not a de Polignac number, because 21311013101 - 2¹⁰ = 21311012077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311013601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 699770 + ... + 729588.

It is an arithmetic number, because the mean of its divisors is an integer number (1066383080).

Almost surely, 2^21311013101 is an apocalyptic number.

It is an amenable number.

21311013101 is a deficient number, since it is larger than the sum of its proper divisors (4282180819).

21311013101 is a wasteful number, since it uses less digits than its factorization.

21311013101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30065 (or 30042 counting only the distinct ones).

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

Adding to 21311013101 its reverse (10131011312), we get a palindrome (31442024413).

The spelling of 21311013101 in words is "twenty-one billion, three hundred eleven million, thirteen thousand, one hundred one".