1211231023212 has 24 divisors (see below), whose sum is σ = 3229949395456. Its totient is φ = 346066006608.

The previous prime is 1211231023207. The next prime is 1211231023271. The reversal of 1211231023212 is 2123201321121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7209708388 + ... + 7209708555.

Almost surely, 2^{1211231023212} is an apocalyptic number.

1211231023212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211231023212 is an abundant number, since it is smaller than the sum of its proper divisors (2018718372244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211231023212 is a wasteful number, since it uses less digits than its factorization.

1211231023212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14419416957 (or 14419416955 counting only the distinct ones).

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

Adding to 1211231023212 its reverse (2123201321121), we get a palindrome (3334432344333).

The spelling of 1211231023212 in words is "one trillion, two hundred eleven billion, two hundred thirty-one million, twenty-three thousand, two hundred twelve".