122012110021 has 4 divisors (see below), whose sum is σ = 122013100972. Its totient is φ = 122011119072.

The previous prime is 122012110009. The next prime is 122012110063. The reversal of 122012110021 is 120011210221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 73297440225 + 48714669796 = 270735^2 + 220714^2 .

It is a cyclic number.

It is not a de Polignac number, because 122012110021 - 2³¹ = 119864626373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122012109983 and 122012110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122012110081) 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, 279366 + ... + 567511.

It is an arithmetic number, because the mean of its divisors is an integer number (30503275243).

Almost surely, 2^122012110021 is an apocalyptic number.

It is an amenable number.

122012110021 is a deficient number, since it is larger than the sum of its proper divisors (990951).

122012110021 is an equidigital number, since it uses as much as digits as its factorization.

122012110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990950.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 122012110021 its reverse (120011210221), we get a palindrome (242023320242).

The spelling of 122012110021 in words is "one hundred twenty-two billion, twelve million, one hundred ten thousand, twenty-one".