20121122213 has 4 divisors (see below), whose sum is σ = 20134709868. Its totient is φ = 20107534560.

The previous prime is 20121122209. The next prime is 20121122237. The reversal of 20121122213 is 31222112102.

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 14588291524 + 5532830689 = 120782^2 + 74383^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121122213 - 2² = 20121122209 is a prime.

It is a super-2 number, since 2×20121122213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121122191 and 20121122200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121121213) 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, 6791606 + ... + 6794567.

It is an arithmetic number, because the mean of its divisors is an integer number (5033677467).

Almost surely, 2^20121122213 is an apocalyptic number.

It is an amenable number.

20121122213 is a deficient number, since it is larger than the sum of its proper divisors (13587655).

20121122213 is a wasteful number, since it uses less digits than its factorization.

20121122213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13587654.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20121122213 its reverse (31222112102), we get a palindrome (51343234315).

The spelling of 20121122213 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred thirteen".