21022112105 has 8 divisors (see below), whose sum is σ = 25250589000. Its totient is φ = 16801653376.

The previous prime is 21022112101. The next prime is 21022112117. The reversal of 21022112105 is 50121122012.

It can be written as a sum of positive squares in 4 ways, for example, as 13902296464 + 7119815641 = 117908^2 + 84379^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21022112105 - 2² = 21022112101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022112101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1998770 + ... + 2009259.

It is an arithmetic number, because the mean of its divisors is an integer number (3156323625).

Almost surely, 2^21022112105 is an apocalyptic number.

It is an amenable number.

21022112105 is a deficient number, since it is larger than the sum of its proper divisors (4228476895).

21022112105 is a wasteful number, since it uses less digits than its factorization.

21022112105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009083.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21022112105 its reverse (50121122012), we get a palindrome (71143234117).

The spelling of 21022112105 in words is "twenty-one billion, twenty-two million, one hundred twelve thousand, one hundred five".