1212122121021 has 24 divisors (see below), whose sum is σ = 2001060894144. Its totient is φ = 692607499200.

The previous prime is 1212122121013. The next prime is 1212122121037. The reversal of 1212122121021 is 1201212212121.

1212122121021 is a `hidden beast` number, since 1 + 212 + 1 + 221 + 210 + 21 = 666.

It is not a de Polignac number, because 1212122121021 - 2³ = 1212122121013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212122120985 and 1212122121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212122120021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 866346 + ... + 1781796.

It is an arithmetic number, because the mean of its divisors is an integer number (83377537256).

Almost surely, 2^{1212122121021} is an apocalyptic number.

It is an amenable number.

1212122121021 is a deficient number, since it is larger than the sum of its proper divisors (788938773123).

1212122121021 is a wasteful number, since it uses less digits than its factorization.

1212122121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936481 (or 936478 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212122121021 its reverse (1201212212121), we get a palindrome (2413334333142).

The spelling of 1212122121021 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-one".