21011012113 has 32 divisors (see below), whose sum is σ = 27398407680. Its totient is φ = 15636188160.

The previous prime is 21011012089. The next prime is 21011012119. The reversal of 21011012113 is 31121011012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21011012113 - 2⁹ = 21011011601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21011012093 and 21011012102.

It is not an unprimeable number, because it can be changed into a prime (21011012119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3151003 + ... + 3157663.

It is an arithmetic number, because the mean of its divisors is an integer number (856200240).

Almost surely, 2^21011012113 is an apocalyptic number.

It is an amenable number.

21011012113 is a deficient number, since it is larger than the sum of its proper divisors (6387395567).

21011012113 is a wasteful number, since it uses less digits than its factorization.

21011012113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8737.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21011012113 its reverse (31121011012), we get a palindrome (52132023125).

The spelling of 21011012113 in words is "twenty-one billion, eleven million, twelve thousand, one hundred thirteen".