1211540230 has 16 divisors (see below), whose sum is σ = 2213322480. Its totient is φ = 477382752.

The previous prime is 1211540219. The next prime is 1211540251. The reversal of 1211540230 is 320451121.

It is a junction number, because it is equal to n+sod(n) for n = 1211540198 and 1211540207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 903465 + ... + 904804.

It is an arithmetic number, because the mean of its divisors is an integer number (138332655).

Almost surely, 2^1211540230 is an apocalyptic number.

1211540230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211540230 is a deficient number, since it is larger than the sum of its proper divisors (1001782250).

1211540230 is a wasteful number, since it uses less digits than its factorization.

1211540230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808343.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1211540230 is about 34807.1864706126. The cubic root of 1211540230 is about 1066.0541862497.

Adding to 1211540230 its reverse (320451121), we get a palindrome (1531991351).

The spelling of 1211540230 in words is "one billion, two hundred eleven million, five hundred forty thousand, two hundred thirty".