21138308102207 has 8 divisors (see below), whose sum is σ = 22107609553920. Its totient is φ = 20173193698680.

The previous prime is 21138308102183. The next prime is 21138308102209. The reversal of 21138308102207 is 70220180383112.

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 21138308102207 - 2⁶ = 21138308102143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21138308102209) 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, 1046751719 + ... + 1046771912.

It is an arithmetic number, because the mean of its divisors is an integer number (2763451194240).

Almost surely, 2^{21138308102207} is an apocalyptic number.

21138308102207 is a deficient number, since it is larger than the sum of its proper divisors (969301451713).

21138308102207 is a wasteful number, since it uses less digits than its factorization.

21138308102207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093524093.

The product of its (nonzero) digits is 32256, while the sum is 38.

Adding to 21138308102207 its reverse (70220180383112), we get a palindrome (91358488485319).

The spelling of 21138308102207 in words is "twenty-one trillion, one hundred thirty-eight billion, three hundred eight million, one hundred two thousand, two hundred seven".