1212205505 has 16 divisors (see below), whose sum is σ = 1663987584. Its totient is φ = 830459520.

The previous prime is 1212205471. The next prime is 1212205523. The reversal of 1212205505 is 5055022121.

It is not a de Polignac number, because 1212205505 - 2¹⁸ = 1211943361 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23885 + ... + 54725.

It is an arithmetic number, because the mean of its divisors is an integer number (103999224).

Almost surely, 2^1212205505 is an apocalyptic number.

It is an amenable number.

1212205505 is a deficient number, since it is larger than the sum of its proper divisors (451782079).

1212205505 is a wasteful number, since it uses less digits than its factorization.

1212205505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31976.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 1212205505 is about 34816.7417344013. The cubic root of 1212205505 is about 1066.2492793515.

Adding to 1212205505 its reverse (5055022121), we get a palindrome (6267227626).

The spelling of 1212205505 in words is "one billion, two hundred twelve million, two hundred five thousand, five hundred five".