21244132105 has 16 divisors (see below), whose sum is σ = 29138465664. Its totient is φ = 14565576960.

The previous prime is 21244132099. The next prime is 21244132109. The reversal of 21244132105 is 50123144212.

It is not a de Polignac number, because 21244132105 - 2²³ = 21235743497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21244132105.

It is not an unprimeable number, because it can be changed into a prime (21244132109) 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, 282945 + ... + 350065.

It is an arithmetic number, because the mean of its divisors is an integer number (1821154104).

Almost surely, 2^21244132105 is an apocalyptic number.

It is an amenable number.

21244132105 is a deficient number, since it is larger than the sum of its proper divisors (7894333559).

21244132105 is an equidigital number, since it uses as much as digits as its factorization.

21244132105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76176.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21244132105 its reverse (50123144212), we get a palindrome (71367276317).

The spelling of 21244132105 in words is "twenty-one billion, two hundred forty-four million, one hundred thirty-two thousand, one hundred five".