1212355403 has 12 divisors (see below), whose sum is σ = 1410912792. Its totient is φ = 1038703680.

The previous prime is 1212355393. The next prime is 1212355427. The reversal of 1212355403 is 3045532121.

It is a happy number.

It is not a de Polignac number, because 1212355403 - 2⁴ = 1212355387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212355453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153788 + ... + 161478.

It is an arithmetic number, because the mean of its divisors is an integer number (117576066).

Almost surely, 2^1212355403 is an apocalyptic number.

1212355403 is a deficient number, since it is larger than the sum of its proper divisors (198557389).

1212355403 is an equidigital number, since it uses as much as digits as its factorization.

1212355403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10922 (or 10915 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1212355403 is about 34818.8943391372. The cubic root of 1212355403 is about 1066.2932273582.

Adding to 1212355403 its reverse (3045532121), we get a palindrome (4257887524).

The spelling of 1212355403 in words is "one billion, two hundred twelve million, three hundred fifty-five thousand, four hundred three".