1212138171 has 12 divisors (see below), whose sum is σ = 1751894560. Its totient is φ = 807617520.

The previous prime is 1212138149. The next prime is 1212138181. The reversal of 1212138171 is 1718312121.

1212138171 is a `hidden beast` number, since 1 + 212 + 1 + 381 + 71 = 666.

It is not a de Polignac number, because 1212138171 - 2⁷ = 1212138043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212138181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23011 + ... + 54348.

Almost surely, 2^1212138171 is an apocalyptic number.

1212138171 is a deficient number, since it is larger than the sum of its proper divisors (539756389).

1212138171 is a wasteful number, since it uses less digits than its factorization.

1212138171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79106 (or 79103 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 1212138171 is about 34815.7747436417. The cubic root of 1212138171 is about 1066.2295367809.

The spelling of 1212138171 in words is "one billion, two hundred twelve million, one hundred thirty-eight thousand, one hundred seventy-one".