21212122022113 has 16 divisors (see below), whose sum is σ = 23357786630976. Its totient is φ = 19102855242240.

The previous prime is 21212122022057. The next prime is 21212122022137. The reversal of 21212122022113 is 31122022121212.

It is not a de Polignac number, because 21212122022113 - 2²⁵ = 21212088467681 is a prime.

It is a super-2 number, since 2×21212122022113² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212122022153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2249556 + ... + 6890917.

It is an arithmetic number, because the mean of its divisors is an integer number (1459861664436).

Almost surely, 2^{21212122022113} is an apocalyptic number.

It is an amenable number.

21212122022113 is a deficient number, since it is larger than the sum of its proper divisors (2145664608863).

21212122022113 is a wasteful number, since it uses less digits than its factorization.

21212122022113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9142464.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21212122022113 its reverse (31122022121212), we get a palindrome (52334144143325).

Subtracting 21212122022113 from its reverse (31122022121212), we obtain a palindrome (9909900099099).

The spelling of 21212122022113 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, twenty-two thousand, one hundred thirteen".