21012230113 has 16 divisors (see below), whose sum is σ = 24603312384. Its totient is φ = 17573713920.

The previous prime is 21012230069. The next prime is 21012230123. The reversal of 21012230113 is 31103221012.

It is not a de Polignac number, because 21012230113 - 2¹³ = 21012221921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012230123) 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 15 ways as a sum of consecutive naturals, for example, 169720 + ... + 266137.

It is an arithmetic number, because the mean of its divisors is an integer number (1537707024).

Almost surely, 2^21012230113 is an apocalyptic number.

It is an amenable number.

21012230113 is a deficient number, since it is larger than the sum of its proper divisors (3591082271).

21012230113 is an equidigital number, since it uses as much as digits as its factorization.

21012230113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436032.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21012230113 its reverse (31103221012), we get a palindrome (52115451125).

The spelling of 21012230113 in words is "twenty-one billion, twelve million, two hundred thirty thousand, one hundred thirteen".