1212403204221 has 96 divisors (see below), whose sum is σ = 1891159902720. Its totient is φ = 683221392000.

The previous prime is 1212403204213. The next prime is 1212403204223. The reversal of 1212403204221 is 1224023042121.

It is not a de Polignac number, because 1212403204221 - 2³ = 1212403204213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212403204191 and 1212403204200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212403204223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1021400590 + ... + 1021401776.

It is an arithmetic number, because the mean of its divisors is an integer number (19699582320).

Almost surely, 2^{1212403204221} is an apocalyptic number.

1212403204221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212403204221 is a deficient number, since it is larger than the sum of its proper divisors (678756698499).

1212403204221 is a wasteful number, since it uses less digits than its factorization.

1212403204221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575 (or 1448 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 1212403204221 its reverse (1224023042121), we get a palindrome (2436426246342).

The spelling of 1212403204221 in words is "one trillion, two hundred twelve billion, four hundred three million, two hundred four thousand, two hundred twenty-one".