1211201121012 has 48 divisors (see below), whose sum is σ = 2845875174912. Its totient is φ = 400918001760.

The previous prime is 1211201120959. The next prime is 1211201121017. The reversal of 1211201121012 is 2101211021121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1211201120982 and 1211201121000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211201121017) 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, 2060937 + ... + 2582607.

It is an arithmetic number, because the mean of its divisors is an integer number (59289066144).

Almost surely, 2^{1211201121012} is an apocalyptic number.

1211201121012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211201121012 is an abundant number, since it is smaller than the sum of its proper divisors (1634674053900).

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

1211201121012 is a wasteful number, since it uses less digits than its factorization.

1211201121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523028 (or 523026 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211201121012 its reverse (2101211021121), we get a palindrome (3312412142133).

The spelling of 1211201121012 in words is "one trillion, two hundred eleven billion, two hundred one million, one hundred twenty-one thousand, twelve".