1271211809152 has 16 divisors (see below), whose sum is σ = 2532492276300. Its totient is φ = 635605904512.

The previous prime is 1271211809149. The next prime is 1271211809173. The reversal of 1271211809152 is 2519081121721.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4965671002 + ... + 4965671257.

Almost surely, 2^{1271211809152} is an apocalyptic number.

It is an amenable number.

1271211809152 is a deficient number, since it is larger than the sum of its proper divisors (1261280467148).

1271211809152 is an frugal number, since it uses more digits than its factorization.

1271211809152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9931342273 (or 9931342261 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 40.

The spelling of 1271211809152 in words is "one trillion, two hundred seventy-one billion, two hundred eleven million, eight hundred nine thousand, one hundred fifty-two".