21103011331211 has 16 divisors (see below), whose sum is σ = 21664314397440. Its totient is φ = 20544921186720.

The previous prime is 21103011331151. The next prime is 21103011331243. The reversal of 21103011331211 is 11213311030112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103011331211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103011331261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460048385 + ... + 460094253.

It is an arithmetic number, because the mean of its divisors is an integer number (1354019649840).

Almost surely, 2^{21103011331211} is an apocalyptic number.

21103011331211 is a deficient number, since it is larger than the sum of its proper divisors (561303066229).

21103011331211 is a wasteful number, since it uses less digits than its factorization.

21103011331211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80626.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 21103011331211 its reverse (11213311030112), we get a palindrome (32316322361323).

The spelling of 21103011331211 in words is "twenty-one trillion, one hundred three billion, eleven million, three hundred thirty-one thousand, two hundred eleven".