21101202682806 has 16 divisors (see below), whose sum is σ = 42796805442048. Its totient is φ = 6934667548200.

The previous prime is 21101202682801. The next prime is 21101202682831. The reversal of 21101202682806 is 60828620210112.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101202682801) 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, 24766669390 + ... + 24766670241.

It is an arithmetic number, because the mean of its divisors is an integer number (2674800340128).

Almost surely, 2^{21101202682806} is an apocalyptic number.

21101202682806 is an abundant number, since it is smaller than the sum of its proper divisors (21695602759242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21101202682806 is a wasteful number, since it uses less digits than its factorization.

21101202682806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49533339707.

The product of its (nonzero) digits is 36864, while the sum is 39.

Adding to 21101202682806 its reverse (60828620210112), we get a palindrome (81929822892918).

The spelling of 21101202682806 in words is "twenty-one trillion, one hundred one billion, two hundred two million, six hundred eighty-two thousand, eight hundred six".