21210121011113 has 16 divisors (see below), whose sum is σ = 21727515427200. Its totient is φ = 20700391536000.

The previous prime is 21210121011097. The next prime is 21210121011119. The reversal of 21210121011113 is 31111012101212.

It is a cyclic number.

It is not a de Polignac number, because 21210121011113 - 2⁴ = 21210121011097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21210121011091 and 21210121011100.

It is not an unprimeable number, because it can be changed into a prime (21210121011119) 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, 1605263 + ... + 6707988.

It is an arithmetic number, because the mean of its divisors is an integer number (1357969714200).

Almost surely, 2^{21210121011113} is an apocalyptic number.

It is an amenable number.

21210121011113 is a deficient number, since it is larger than the sum of its proper divisors (517394416087).

21210121011113 is a wasteful number, since it uses less digits than its factorization.

21210121011113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8313712.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 21210121011113 its reverse (31111012101212), we get a palindrome (52321133112325).

The spelling of 21210121011113 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-one million, eleven thousand, one hundred thirteen".