1212191944855 has 32 divisors (see below), whose sum is σ = 1533421209600. Its totient is φ = 917376192000.

The previous prime is 1212191944771. The next prime is 1212191944871. The reversal of 1212191944855 is 5584491912121.

It is a happy number.

It is not a de Polignac number, because 1212191944855 - 2³³ = 1203602010263 is a prime.

It is a super-2 number, since 2×1212191944855² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309309586 + ... + 309313504.

It is an arithmetic number, because the mean of its divisors is an integer number (47919412800).

Almost surely, 2^{1212191944855} is an apocalyptic number.

1212191944855 is a deficient number, since it is larger than the sum of its proper divisors (321229264745).

1212191944855 is a wasteful number, since it uses less digits than its factorization.

1212191944855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7855.

The product of its digits is 1036800, while the sum is 52.

The spelling of 1212191944855 in words is "one trillion, two hundred twelve billion, one hundred ninety-one million, nine hundred forty-four thousand, eight hundred fifty-five".