1271355921550 has 192 divisors, whose sum is σ = 2829688888320. Its totient is φ = 418852800000.

The previous prime is 1271355921547. The next prime is 1271355921551. The reversal of 1271355921550 is 551295531721.

It is a self number, because there is not a number n which added to its sum of digits gives 1271355921550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271355921551) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 316807344 + ... + 316811356.

It is an arithmetic number, because the mean of its divisors is an integer number (14737962960).

Almost surely, 2^{1271355921550} is an apocalyptic number.

1271355921550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1271355921550 is an abundant number, since it is smaller than the sum of its proper divisors (1558332966770).

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

1271355921550 is a wasteful number, since it uses less digits than its factorization.

1271355921550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4859 (or 4854 counting only the distinct ones).

The product of its (nonzero) digits is 472500, while the sum is 46.

The spelling of 1271355921550 in words is "one trillion, two hundred seventy-one billion, three hundred fifty-five million, nine hundred twenty-one thousand, five hundred fifty".