21122122122113 has 4 divisors (see below), whose sum is σ = 22364599894020. Its totient is φ = 19879644350208.

The previous prime is 21122122122091. The next prime is 21122122122121. The reversal of 21122122122113 is 31122122122112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18339874770064 + 2782247352049 = 4282508^2 + 1668007^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122122122113 - 2¹² = 21122122118017 is a prime.

It is a super-2 number, since 2×21122122122113² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21122122122173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621238885928 + ... + 621238885961.

It is an arithmetic number, because the mean of its divisors is an integer number (5591149973505).

Almost surely, 2^{21122122122113} is an apocalyptic number.

It is an amenable number.

21122122122113 is a deficient number, since it is larger than the sum of its proper divisors (1242477771907).

21122122122113 is a wasteful number, since it uses less digits than its factorization.

21122122122113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242477771906.

The product of its digits is 384, while the sum is 23.

Adding to 21122122122113 its reverse (31122122122112), we get a palindrome (52244244244225).

Subtracting 21122122122113 from its reverse (31122122122112), we obtain a palindrome (9999999999999).

The spelling of 21122122122113 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred thirteen".