21234200105 has 24 divisors (see below), whose sum is σ = 26229775320. Its totient is φ = 16500723200.

The previous prime is 21234200087. The next prime is 21234200129. The reversal of 21234200105 is 50100243212.

It can be written as a sum of positive squares in 12 ways, for example, as 2065520704 + 19168679401 = 45448^2 + 138451^2 .

It is not a de Polignac number, because 21234200105 - 2⁶ = 21234200041 is a prime.

It is a super-2 number, since 2×21234200105² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1411061 + ... + 1426029.

It is an arithmetic number, because the mean of its divisors is an integer number (1092907305).

Almost surely, 2^21234200105 is an apocalyptic number.

It is an amenable number.

21234200105 is a deficient number, since it is larger than the sum of its proper divisors (4995575215).

21234200105 is a wasteful number, since it uses less digits than its factorization.

21234200105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15181 (or 15128 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21234200105 its reverse (50100243212), we get a palindrome (71334443317).

The spelling of 21234200105 in words is "twenty-one billion, two hundred thirty-four million, two hundred thousand, one hundred five".