1211420434 has 32 divisors (see below), whose sum is σ = 2150812800. Its totient is φ = 511411824.

The previous prime is 1211420407. The next prime is 1211420437. The reversal of 1211420434 is 4340241121.

It is a happy number.

It is a super-3 number, since 3×1211420434³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211420437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32784 + ... + 59140.

It is an arithmetic number, because the mean of its divisors is an integer number (67212900).

Almost surely, 2^1211420434 is an apocalyptic number.

1211420434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1211420434 is a deficient number, since it is larger than the sum of its proper divisors (939392366).

1211420434 is an equidigital number, since it uses as much as digits as its factorization.

1211420434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26447 (or 26433 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1211420434 is about 34805.4655765442. The cubic root of 1211420434 is about 1066.0190482676.

Adding to 1211420434 its reverse (4340241121), we get a palindrome (5551661555).

The spelling of 1211420434 in words is "one billion, two hundred eleven million, four hundred twenty thousand, four hundred thirty-four".