122121010112111 has 4 divisors (see below), whose sum is σ = 123201727015872. Its totient is φ = 121040293208352.

The previous prime is 122121010112099. The next prime is 122121010112137. The reversal of 122121010112111 is 111211010121221.

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 122121010112111 - 2¹⁸ = 122121009849967 is a prime.

It is a super-2 number, since 2×122121010112111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122121010112111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122121010112161) 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, 540358451711 + ... + 540358451936.

It is an arithmetic number, because the mean of its divisors is an integer number (30800431753968).

Almost surely, 2^{122121010112111} is an apocalyptic number.

122121010112111 is a deficient number, since it is larger than the sum of its proper divisors (1080716903761).

122121010112111 is a wasteful number, since it uses less digits than its factorization.

122121010112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080716903760.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 122121010112111 its reverse (111211010121221), we get a palindrome (233332020233332).

The spelling of 122121010112111 in words is "one hundred twenty-two trillion, one hundred twenty-one billion, ten million, one hundred twelve thousand, one hundred eleven".