1212000100221 has 16 divisors (see below), whose sum is σ = 1701081444800. Its totient is φ = 765460844928.

The previous prime is 1212000100211. The next prime is 1212000100229. The reversal of 1212000100221 is 1220010002121.

It is not a de Polignac number, because 1212000100221 - 2⁷ = 1212000100093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212000100197 and 1212000100206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212000100229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4135425 + ... + 4418793.

It is an arithmetic number, because the mean of its divisors is an integer number (106317590300).

Almost surely, 2^{1212000100221} is an apocalyptic number.

It is an amenable number.

1212000100221 is a deficient number, since it is larger than the sum of its proper divisors (489081344579).

1212000100221 is a wasteful number, since it uses less digits than its factorization.

1212000100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358428.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1212000100221 its reverse (1220010002121), we get a palindrome (2432010102342).

The spelling of 1212000100221 in words is "one trillion, two hundred twelve billion, one hundred thousand, two hundred twenty-one".