1211000000012 has 24 divisors (see below), whose sum is σ = 2355530021712. Its totient is φ = 540068609600.

The previous prime is 1210999999933. The next prime is 1211000000099. The reversal of 1211000000012 is 2100000001121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259646039 + ... + 259650702.

It is an arithmetic number, because the mean of its divisors is an integer number (98147084238).

Almost surely, 2^{1211000000012} is an apocalyptic number.

It is an amenable number.

1211000000012 is a deficient number, since it is larger than the sum of its proper divisors (1144530021700).

1211000000012 is a wasteful number, since it uses less digits than its factorization.

1211000000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519296809 (or 519296807 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 1211000000012 its reverse (2100000001121), we get a palindrome (3311000001133).

The spelling of 1211000000012 in words is "one trillion, two hundred eleven billion, twelve", and thus it is an aban number.