21300121011 has 12 divisors (see below), whose sum is σ = 30752838168. Its totient is φ = 13107766464.

The previous prime is 21300121001. The next prime is 21300121043. The reversal of 21300121011 is 11012100312.

It is not a de Polignac number, because 21300121011 - 2⁵ = 21300120979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21300121001) 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 11 ways as a sum of consecutive naturals, for example, 21005530 + ... + 21006543.

It is an arithmetic number, because the mean of its divisors is an integer number (2562736514).

Almost surely, 2^21300121011 is an apocalyptic number.

21300121011 is a deficient number, since it is larger than the sum of its proper divisors (9452717157).

21300121011 is a wasteful number, since it uses less digits than its factorization.

21300121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42012102 (or 42012089 counting only the distinct ones).

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

Adding to 21300121011 its reverse (11012100312), we get a palindrome (32312221323).

It can be divided in two parts, 21300 and 121011, that added together give a triangular number (142311 = T₅₃₃).

The spelling of 21300121011 in words is "twenty-one billion, three hundred million, one hundred twenty-one thousand, eleven".