21123321311211 has 32 divisors (see below), whose sum is σ = 33244487354880. Its totient is φ = 11680495467264.

The previous prime is 21123321311203. The next prime is 21123321311219. The reversal of 21123321311211 is 11211312332112.

It is an interprime number because it is at equal distance from previous prime (21123321311203) and next prime (21123321311219).

It is not a de Polignac number, because 21123321311211 - 2³ = 21123321311203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21123321311219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129910021 + ... + 130072518.

It is an arithmetic number, because the mean of its divisors is an integer number (1038890229840).

Almost surely, 2^{21123321311211} is an apocalyptic number.

21123321311211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21123321311211 is a deficient number, since it is larger than the sum of its proper divisors (12121166043669).

21123321311211 is a wasteful number, since it uses less digits than its factorization.

21123321311211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259982675.

The product of its digits is 432, while the sum is 24.

Adding to 21123321311211 its reverse (11211312332112), we get a palindrome (32334633643323).

The spelling of 21123321311211 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred twenty-one million, three hundred eleven thousand, two hundred eleven".