1271202661212 has 24 divisors (see below), whose sum is σ = 3235788592512. Its totient is φ = 385212927600.

The previous prime is 1271202661189. The next prime is 1271202661217. The reversal of 1271202661212 is 2121662021721.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271202661217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4815161464 + ... + 4815161727.

It is an arithmetic number, because the mean of its divisors is an integer number (134824524688).

Almost surely, 2^{1271202661212} is an apocalyptic number.

1271202661212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1271202661212 is an abundant number, since it is smaller than the sum of its proper divisors (1964585931300).

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

1271202661212 is a wasteful number, since it uses less digits than its factorization.

1271202661212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9630323209 (or 9630323207 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

Adding to 1271202661212 its reverse (2121662021721), we get a palindrome (3392864682933).

The spelling of 1271202661212 in words is "one trillion, two hundred seventy-one billion, two hundred two million, six hundred sixty-one thousand, two hundred twelve".