1000122121111 has 4 divisors (see below), whose sum is σ = 1000126459224. Its totient is φ = 1000117783000.

The previous prime is 1000122121013. The next prime is 1000122121121. The reversal of 1000122121111 is 1111212210001.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1000122121111 - 2¹⁹ = 1000121596823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000122121091 and 1000122121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000122121121) 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, 1802605 + ... + 2291206.

It is an arithmetic number, because the mean of its divisors is an integer number (250031614806).

Almost surely, 2^{1000122121111} is an apocalyptic number.

1000122121111 is a deficient number, since it is larger than the sum of its proper divisors (4338113).

1000122121111 is an equidigital number, since it uses as much as digits as its factorization.

1000122121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4338112.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1000122121111 its reverse (1111212210001), we get a palindrome (2111334331112).

The spelling of 1000122121111 in words is "one trillion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".