21011002113 has 16 divisors (see below), whose sum is σ = 29428905600. Its totient is φ = 13308392064.

The previous prime is 21011002087. The next prime is 21011002141. The reversal of 21011002113 is 31120011012.

It is not a de Polignac number, because 21011002113 - 2²⁴ = 20994224897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011002163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1011556 + ... + 1032117.

It is an arithmetic number, because the mean of its divisors is an integer number (1839306600).

Almost surely, 2^21011002113 is an apocalyptic number.

21011002113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21011002113 is a deficient number, since it is larger than the sum of its proper divisors (8417903487).

21011002113 is a wasteful number, since it uses less digits than its factorization.

21011002113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043848.

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

Adding to 21011002113 its reverse (31120011012), we get a palindrome (52131013125).

The spelling of 21011002113 in words is "twenty-one billion, eleven million, two thousand, one hundred thirteen".