1011213205 has 4 divisors (see below), whose sum is σ = 1213455852. Its totient is φ = 808970560.

The previous prime is 1011213197. The next prime is 1011213221. The reversal of 1011213205 is 5023121101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 304397809 + 706815396 = 17447^2 + 26586^2 .

It is not a de Polignac number, because 1011213205 - 2³ = 1011213197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101121316 + ... + 101121325.

It is an arithmetic number, because the mean of its divisors is an integer number (303363963).

Almost surely, 2^1011213205 is an apocalyptic number.

It is an amenable number.

1011213205 is a deficient number, since it is larger than the sum of its proper divisors (202242647).

1011213205 is an equidigital number, since it uses as much as digits as its factorization.

1011213205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202242646.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1011213205 is about 31799.5786921777. The cubic root of 1011213205 is about 1003.7238507228.

Adding to 1011213205 its reverse (5023121101), we get a palindrome (6034334306).

The spelling of 1011213205 in words is "one billion, eleven million, two hundred thirteen thousand, two hundred five".