1213145211 has 8 divisors (see below), whose sum is σ = 1712675664. Its totient is φ = 761189120.

The previous prime is 1213145203. The next prime is 1213145221. The reversal of 1213145211 is 1125413121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213145211 - 2³ = 1213145203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213145201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11893530 + ... + 11893631.

It is an arithmetic number, because the mean of its divisors is an integer number (214084458).

Almost surely, 2^1213145211 is an apocalyptic number.

1213145211 is a deficient number, since it is larger than the sum of its proper divisors (499530453).

1213145211 is a wasteful number, since it uses less digits than its factorization.

1213145211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23787181.

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

The square root of 1213145211 is about 34830.2341508064. The cubic root of 1213145211 is about 1066.5247282598.

Adding to 1213145211 its reverse (1125413121), we get a palindrome (2338558332).

The spelling of 1213145211 in words is "one billion, two hundred thirteen million, one hundred forty-five thousand, two hundred eleven".