21300121443 has 16 divisors (see below), whose sum is σ = 28632100896. Its totient is φ = 14084290560.

The previous prime is 21300121429. The next prime is 21300121511. The reversal of 21300121443 is 34412100312.

It is not a de Polignac number, because 21300121443 - 2¹³ = 21300113251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21300121043) 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, 468603 + ... + 512043.

It is an arithmetic number, because the mean of its divisors is an integer number (1789506306).

Almost surely, 2^21300121443 is an apocalyptic number.

21300121443 is a deficient number, since it is larger than the sum of its proper divisors (7331979453).

21300121443 is a wasteful number, since it uses less digits than its factorization.

21300121443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44774.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21300121443 its reverse (34412100312), we get a palindrome (55712221755).

The spelling of 21300121443 in words is "twenty-one billion, three hundred million, one hundred twenty-one thousand, four hundred forty-three".