1200000001212 has 36 divisors (see below), whose sum is σ = 3041131143960. Its totient is φ = 398971718112.

The previous prime is 1200000001199. The next prime is 1200000001261. The reversal of 1200000001212 is 2121000000021.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1200000001194 and 1200000001203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42830898 + ... + 42858905.

It is an arithmetic number, because the mean of its divisors is an integer number (84475865110).

Almost surely, 2^{1200000001212} is an apocalyptic number.

1200000001212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1200000001212 is an abundant number, since it is smaller than the sum of its proper divisors (1841131142748).

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

1200000001212 is a wasteful number, since it uses less digits than its factorization.

1200000001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85690202 (or 85690197 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1200000001212 its reverse (2121000000021), we get a palindrome (3321000001233).

The spelling of 1200000001212 in words is "one trillion, two hundred billion, one thousand, two hundred twelve".