1211232201012 has 18 divisors (see below), whose sum is σ = 3061725841538. Its totient is φ = 403744066992.

The previous prime is 1211232200993. The next prime is 1211232201013. The reversal of 1211232201012 is 2101022321121.

It can be written as a sum of positive squares in only one way, i.e., 1117177125156 + 94055075856 = 1056966^2 + 306684^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211232201013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16822669423 + ... + 16822669494.

Almost surely, 2^{1211232201012} is an apocalyptic number.

1211232201012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211232201012 is an abundant number, since it is smaller than the sum of its proper divisors (1850493640526).

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

1211232201012 is a wasteful number, since it uses less digits than its factorization.

1211232201012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33645338927 (or 33645338922 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1211232201012 its reverse (2101022321121), we get a palindrome (3312254522133).

The spelling of 1211232201012 in words is "one trillion, two hundred eleven billion, two hundred thirty-two million, two hundred one thousand, twelve".