1211512134 has 32 divisors (see below), whose sum is σ = 2781285120. Its totient is φ = 344632032.

The previous prime is 1211512117. The next prime is 1211512139. The reversal of 1211512134 is 4312151121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1211512134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211512139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53364 + ... + 72599.

It is an arithmetic number, because the mean of its divisors is an integer number (86915160).

Almost surely, 2^1211512134 is an apocalyptic number.

1211512134 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1211512134 is an abundant number, since it is smaller than the sum of its proper divisors (1569772986).

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

1211512134 is a wasteful number, since it uses less digits than its factorization.

1211512134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126204.

The product of its digits is 240, while the sum is 21.

The square root of 1211512134 is about 34806.7828734573. The cubic root of 1211512134 is about 1066.0459454751.

Adding to 1211512134 its reverse (4312151121), we get a palindrome (5523663255).

The spelling of 1211512134 in words is "one billion, two hundred eleven million, five hundred twelve thousand, one hundred thirty-four".