21200111022005 has 8 divisors (see below), whose sum is σ = 25441348896600. Its totient is φ = 16959278370816.

The previous prime is 21200111021983. The next prime is 21200111022011. The reversal of 21200111022005 is 50022011100212.

It can be written as a sum of positive squares in 4 ways, for example, as 737027401009 + 20463083620996 = 858503^2 + 4523614^2 .

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 21200111022005 - 2¹⁰ = 21200111020981 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101190740 + ... + 101400029.

It is an arithmetic number, because the mean of its divisors is an integer number (3180168612075).

Almost surely, 2^{21200111022005} is an apocalyptic number.

It is an amenable number.

21200111022005 is a deficient number, since it is larger than the sum of its proper divisors (4241237874595).

21200111022005 is a wasteful number, since it uses less digits than its factorization.

21200111022005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202611703.

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

Adding to 21200111022005 its reverse (50022011100212), we get a palindrome (71222122122217).

The spelling of 21200111022005 in words is "twenty-one trillion, two hundred billion, one hundred eleven million, twenty-two thousand, five".