1211010505 has 64 divisors (see below), whose sum is σ = 1650401280. Its totient is φ = 849139200.

The previous prime is 1211010497. The next prime is 1211010509. The reversal of 1211010505 is 5050101121.

It is not a de Polignac number, because 1211010505 - 2³ = 1211010497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211010509) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9244290 + ... + 9244420.

It is an arithmetic number, because the mean of its divisors is an integer number (25787520).

Almost surely, 2^1211010505 is an apocalyptic number.

It is an amenable number.

1211010505 is a deficient number, since it is larger than the sum of its proper divisors (439390775).

1211010505 is a wasteful number, since it uses less digits than its factorization.

1211010505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 1211010505 is about 34799.5762186840. The cubic root of 1211010505 is about 1065.8987923514.

Adding to 1211010505 its reverse (5050101121), we get a palindrome (6261111626).

The spelling of 1211010505 in words is "one billion, two hundred eleven million, ten thousand, five hundred five".