1211023430 has 16 divisors (see below), whose sum is σ = 2180609424. Its totient is φ = 484238880.

The previous prime is 1211023409. The next prime is 1211023433. The reversal of 1211023430 is 343201121.

It is a junction number, because it is equal to n+sod(n) for n = 1211023399 and 1211023408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211023433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10829 + ... + 50391.

It is an arithmetic number, because the mean of its divisors is an integer number (136288089).

Almost surely, 2^1211023430 is an apocalyptic number.

1211023430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211023430 is a deficient number, since it is larger than the sum of its proper divisors (969585994).

1211023430 is a wasteful number, since it uses less digits than its factorization.

1211023430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42631.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1211023430 is about 34799.7619244730. The cubic root of 1211023430 is about 1065.9025844168.

Adding to 1211023430 its reverse (343201121), we get a palindrome (1554224551).

The spelling of 1211023430 in words is "one billion, two hundred eleven million, twenty-three thousand, four hundred thirty".