12122221020021 has 48 divisors (see below), whose sum is σ = 20885511069696. Its totient is φ = 6624487175328.

The previous prime is 12122221019999. The next prime is 12122221020023. The reversal of 12122221020021 is 12002012222121.

It is a happy number.

12122221020021 is a `hidden beast` number, since 1 + 212 + 22 + 210 + 200 + 21 = 666.

12122221020021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12122221020021 - 2⁷ = 12122221019893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12122221019976 and 12122221020003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122221020023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6445566 + ... + 8111088.

It is an arithmetic number, because the mean of its divisors is an integer number (435114813952).

Almost surely, 2^{12122221020021} is an apocalyptic number.

It is an amenable number.

12122221020021 is a deficient number, since it is larger than the sum of its proper divisors (8763290049675).

12122221020021 is a wasteful number, since it uses less digits than its factorization.

12122221020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670582 (or 1670579 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12122221020021 its reverse (12002012222121), we get a palindrome (24124233242142).

The spelling of 12122221020021 in words is "twelve trillion, one hundred twenty-two billion, two hundred twenty-one million, twenty thousand, twenty-one".