1221212210133 has 16 divisors (see below), whose sum is σ = 1675110735936. Its totient is φ = 790801793280.

The previous prime is 1221212210077. The next prime is 1221212210149. The reversal of 1221212210133 is 3310122121221.

It is not a de Polignac number, because 1221212210133 - 2¹⁰ = 1221212209109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221212210233) 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, 9210663 + ... + 9342308.

It is an arithmetic number, because the mean of its divisors is an integer number (104694420996).

Almost surely, 2^{1221212210133} is an apocalyptic number.

It is an amenable number.

1221212210133 is a deficient number, since it is larger than the sum of its proper divisors (453898525803).

1221212210133 is a wasteful number, since it uses less digits than its factorization.

1221212210133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18553604.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1221212210133 its reverse (3310122121221), we get a palindrome (4531334331354).

The spelling of 1221212210133 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, one hundred thirty-three".