21421120105 has 32 divisors (see below), whose sum is σ = 32056835328. Its totient is φ = 13349836800.

The previous prime is 21421120093. The next prime is 21421120153. The reversal of 21421120105 is 50102112412.

It is not a de Polignac number, because 21421120105 - 2¹⁹ = 21420595817 is a prime.

It is a super-2 number, since 2×21421120105² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2675989 + ... + 2683981.

It is an arithmetic number, because the mean of its divisors is an integer number (1001776104).

Almost surely, 2^21421120105 is an apocalyptic number.

It is an amenable number.

21421120105 is a deficient number, since it is larger than the sum of its proper divisors (10635715223).

21421120105 is a wasteful number, since it uses less digits than its factorization.

21421120105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14977.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 21421120105 its reverse (50102112412), we get a palindrome (71523232517).

The spelling of 21421120105 in words is "twenty-one billion, four hundred twenty-one million, one hundred twenty thousand, one hundred five".