21264216102106 has 4 divisors (see below), whose sum is σ = 31896324153162. Its totient is φ = 10632108051052.

The previous prime is 21264216102071. The next prime is 21264216102113. The reversal of 21264216102106 is 60120161246212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15628857622225 + 5635358479881 = 3953335^2 + 2373891^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5316054025525 + ... + 5316054025528.

Almost surely, 2^{21264216102106} is an apocalyptic number.

21264216102106 is a deficient number, since it is larger than the sum of its proper divisors (10632108051056).

21264216102106 is a wasteful number, since it uses less digits than its factorization.

21264216102106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10632108051055.

The product of its (nonzero) digits is 13824, while the sum is 34.

Adding to 21264216102106 its reverse (60120161246212), we get a palindrome (81384377348318).

The spelling of 21264216102106 in words is "twenty-one trillion, two hundred sixty-four billion, two hundred sixteen million, one hundred two thousand, one hundred six".